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Patent:CH150651 15.11.1931 Marchant (P) : Machine à calculer. [6.64%]
Patent:CH201041 15.11.1938 : Machine à calculer. [9.18%]
Patent:CH260348 15.03.1949 Fornaroli, Giuseppe : Congegno di cancellazione per macchina calcolatrice. [5.18%]
Patent:CH2660 30.04.1891 Trosset, F. (P), Wicky, A. (P) : Machine à calculer perfectionnée [5.47%]
Patent:CH278640 31.10.1951 Olivetti (P) : Dispositivo di divisione automatico in una macchina calcolatrice scrivente. [2.79%]
Patent:CH318490 15.01.1957 : [9.08%]
Patent:CH377559 15.05.1964 Kitz, Norbert (P) : Rechenmaschine [18.11%]
Patent:CH379807 15.07.1964 Kitz, Norbert (P) : Rechenmaschine [18.11%]
Patent:CH381454 31.08.1964 Kitz, Norbert (P) : Rechenmaschine [18.11%]
Patent:CH384254 15.11.1964 Kitz, Norbert (P) : Rechenmaschine [18.11%]
Patent:CH385519 15.12.1964 NCR (P) : Dispositif dimpression, notamment pour machine à calculer [3.13%]
Patent:CH389290 15.03.1965 : [3.19%]
Patent:CH403319 30.11.1965 : Dispositif pour calculer la moyenne de plusieurs grandeurs statistiques mesurées et pour porter sur un support une marque caractéristique de la valeur de cette moyenne [3.17%]
Patent:CH422392 15.10.1966 NCR (P) : Machine à calculer [3.26%]
Patent:CH436791 31.05.1967 : Machine à calculer de bureau digitale électronique [3.37%]
Patent:CH440771 31.07.1967 Gassino, Teresio (P) Olivetti (P) : Dispositif de commande à programme pour une machine à calculer [3.08%]
Patent:CH470028 15.03.1969 Gross, Henry (P), Gross, Samuel (P) : Machine à additionner, notamment caisse enregistreuse [3.26%]
Patent:CH485276 31.01.1970 Abbiati, Ettore (P) : Dispositif de calcul de nombres décimaux codés selon un code biquinaire [3.18%]
Patent:CH513468 30.09.1971 Kolly, Andre (P) : Dispositif de calcul dune machine à calculer [3.33%]
Patent:CH61228 16.09.1913 : Instrument pour calculer le nombre de jours compris entre deux dates données [9.52%]
Patent:CH89253 02.05.1921 : Porte-copie de machine à écrire, à additionner etc. [16.06%]

Patent:DE12001 01.05.1880 Stefan Geny : Additionsapparat [4.30%]
Patent:DE19701250 23.07.1998 Schulz Rolf : Electro cardiograph date Slide Rule [8.62%]
Patent:DE490610 01.02.1930 Mercedes (P) Bueromaschinen Werke : Rechenmaschine o. dgl. mit Einrichtungen für den Abdruck von die Nullstellung der Zählwerke anzeigenden Klarzeichen [5.59%]
Patent:DE69251 10.05.1892 Proskauer, H. (P) : Additionsmaschine [5.39%]
Patent:DE78876 19.12.1893 Göttsch, A. : Rechenlehrmittel [3.73%]

Patent:FR2788932 04.08.2000 Philippe Thoumie : Planner for watering of plants comprises pivoted disks with numbers indicating date of watering and date when next watering is required [41.48%]
Patent:FR621422 05.02.1927 Sahner, Pierre-Nicolas : Appareil à déterminer le jour de la semaine correspondant à une date donnée [28.74%]

Patent:GB100279 09.11.1916 Johanson, Gustaf Emanuel (P) : Improvements relating to Registering or Counting Apparatus for Machines [18.23%]
Patent:GB100542 24.05.1917 Jaeger, Edmond (P) : Improvements in Speed Indicating Apparatus. [16.87%]
Patent:GB101224 16.08.1917 Liedstrand, Karl Emil Leonard (P) : Improvements in or relating to Cards for Statistical or similar Purposes and in Apparatus for Sorting the Cards [16.74%]
Patent:GB102062 12.04.1917 Jaeger, Edmond (P) : Improvements in or relating to Revolution Counter Apparatus. [16.12%]
Patent:GB102150 11.10.1917 Powers, James (P) : Improvements in recording tabulating machines [16.82%]
Patent:GB1029955 18.05.1966 Lloyd, John George (P) und Kitz, Norbert (P) und Drage, James John (P) Bell Punch (P) Co Ltd : Improvements in or relating to calculating machines [11.96%]
Patent:GB1029957 18.05.1966 Lloyd, John George (P) und Kitz, Norbert (P) und Drage, James John (P) Bell Punch (P) Co Ltd : Improvements in or relating to calculating machines [22.87%]
Patent:GB1029958 18.05.1966 Lloyd, John George (P) und Kitz, Norbert (P) und Drage, James John (P) Bell Punch (P) Co Ltd : Improvements in or relating to calculating machines [23.93%]
Patent:GB1029959 18.05.1966 Lloyd, John George (P) und Kitz, Norbert (P) und Drage, James John (P) Bell Punch (P) Co Ltd : Improvements in or relating to calculating machines [13.83%]
Patent:GB103637 05.04.1917 Smith, Eugene George (P) : Improvements in or relating to Apparatus for the Reception of Coins [16.70%]
Patent:GB108313 27.06.1918 Buck, G. B. Tabulating Machine Co : An Improved Machine for Checking or Verifying the Correctness of the Positions of Holes Punched in Record Cards and the like [16.72%]
Patent:GB108854 23.07.1917 Tinline, William James (P) : Improved Ticket Issuer for use with Totalisators and like Machines. [6.21%]
Patent:GB1112214 01.05.1968 Ng Kek Haut : Calculating instrument [9.70%]
Patent:GB112012 19.12.1918 Giot, Henri Louis Victor Desire (P) : Improvements in Stars Transit Calculators and Indicators for Mariners. [28.66%]
Patent:GB112020 09.12.1916 Loewenstein, Louis Centennial (P) : Improvements in and relating to Volume Correctors. [16.41%]
Patent:GB112681 24.01.1918 Christie, Robert Arthur : Improvements in Slide Rules. [6.47%]
Patent:GB115447 10.05.1918 Banwell, Henry Charles (P) und Phillips, Frederick (P) NCR (P) : Improvements in Autographic Cash Recorders. [6.07%]
Patent:GB1168995 29.10.1969 Heppenstall, Philip; Mear, Norman : Improvements in or relating to Circular Slide Rules [12.11%]
Patent:GB117278 10.07.1918 Bell, Arthur Mitchell (P) : Improvements in Calculating Apparatus particularly applicable for Problems connected with Textile Trades [3.82%]
Patent:GB117463 12.09.1919 Arton Sven : Cash Register. [16.82%]
Patent:GB119041 11.09.1917 Compteurs De Voitures Taximetres : Improvements in Revolution Counters or Mileage Registers. [16.64%]
Patent:GB121677 02.01.1919 Mackenzie Kenneth Donald : Apparatus for Finding or Computing Logarithms and Autilogarithms of [5.21%]
Patent:GB122632 22.05.1919 Watson, John Warren (P) Watson, Richard Adlai (P) : Improvements in Mileage Indicators for Tires. [8.27%]
Patent:GB123725 03.05.1920 Noonan, John Joseph (P) : Improvements in Cloth Measuring and Value Computing Machines. [16.76%]
Patent:GB123938 13.03.1919 Collins, Norman (P) und Wallis Abraham Gray (P) : Improvements in or relating to Clock Movements. [4.10%]
Patent:GB123989 02.09.1920 Poor Charles Lane : Improvements in Calculating Instruments [16.60%]
Patent:GB125998 01.04.1920 Odhner, Valentin Jakob (P) : Improvements in or relating to Transfer Mechanism for Calculating Machines [17.50%]
Patent:GB126308 14.10.1920 Lasker, William Walter (P) : Improvements in Machines for Automatically Compiling, Recording and reckoning Statistics by means of sharped ot perforated Cards [15.97%]
Patent:GB126624 13.05.1920 Liedstrand, Karl Emil Leonard (P) : Improvements in Cards adapted for Statistical or similar purposes [18.18%]
Patent:GB127228 22.07.1919 Fuller, Frederick (P) NCR (P) : Improvements in Cash Registers or the like. [17.25%]
Patent:GB127237 22.07.1919 Fuller, Frederick (P) NCR (P) : Improvements in Cash Registers or the like. [17.67%]
Patent:GB127314 05.06.1919 Brillie Freres Sa Des Atel : Improved Apparatus for Regulating the Aiming of Guns at Aerial Targets [16.35%]
Patent:GB127349 05.06.1919 Routin, Joseph Louis (P) Maison Breguet (P) : Improvements in Chronotelemetrical Apparatus for use in Regulating the firing of Anti Aircraft Guns [16.99%]
Patent:GB127351 05.06.1919 Routin, Joseph Louis (P) Maison Breguet (P) : Improvements in Chronotelemetrical Apparatus for use in Regulating the firing of Anti Aircraft Guns [16.55%]
Patent:GB128002 13.06.1919 Boggio Alfredo Santiago : Improvements in Apparatus for Calculating the Date of Expiry of a Given Period [19.54%]
Patent:GB128207 26.08.1920 Lasker, William Walter (P) : Improvements in Machines for Sorting Statistical Cards and the like. [17.69%]
Patent:GB128217 02.09.1920 Odhner, Valentin Jakob (P) : Improvements in or relating to Locking Devices in Calculating Machines of the Cam-disk and Pin-wheel Type [7.39%]
Patent:GB128220 13.09.1920 Odhner, Valentin Jakob (P) : Improvements in or relating to Means for Shifting the Totalizing-counter Carriage in Calculating Machines of the Pin-wheel and Cam-disc Type [7.81%]
Patent:GB128221 20.05.1920 Odhner, Valentin Jakob (P) : Improvements in or relating to Revolution Counters for the Actuator Wheels in Calculating Machines of the Cam Disc and Pin Wheel Type [11.19%]
Patent:GB128564 16.09.1920 Ford, Hannibal Choate (P) : Improvements in or relating to Range Keeping or Predicting Instruments [17.13%]
Patent:GB129290 04.10.1920 Ford, Hannibal Choate (P) : Improvements in or relating to Apparatus for Electric Step-by-step Signalling Systems [17.01%]
Patent:GB129312 17.07.1919 Marden, Basil Jock Newton (P) : New or Improved Method of Directing a Route to a Pre-determined Destination through an unknown Country by observation of either the Sun, Moon or Stars and an instrument therefor. [16.34%]
Patent:GB131277 16.08.1918 Lake, C. D. Tabulating Machine Co. : Statistical Machines [16.36%]
Patent:GB131584 19.08.1918 Liedstrand, Karl Emil Leonard (P) : Statistics, Compiling and Sorting [18.92%]
Patent:GB131902 27.08.1918 Peirce, John Royden (P) : Distributing Machine [17.17%]
Patent:GB133048 26.09.1918 Odhner, Valentin Jakob (P) : Zeroizing Mechanism [16.21%]
Patent:GB133314 22.12.1916 Sperry, L. B. Sperry Gyroscope Co. : Counting Apparatus, Stop Mechanism [16.54%]
Patent:GB133629 26.02.1919 Soc. Marion et Cie. : plane trigonometry calculators [17.47%]
Patent:GB133682 05.10.1918 Billeter, Max (P); Bohnhorst, O. : Logarithmic Calculators [16.94%]
Patent:GB134558 11.12.1919 Douglas, H. P.; Appleyard, Rollo (P) : Improvements in range finding and like apparatus [7.69%]
Patent:GB134752 13.11.1919 Tidswell, Hubert Royds (P) : Sex Calculator. [20.70%]
Patent:GB134833 05.11.1918 Fabriques des Montres Zenith : Slide Rule [15.32%]
Patent:GB135195 13.11.1918 Sauvageon, L. : plane trigonometry calculators [16.80%]
Patent:GB135490 18.11.1918 Boettcher, A. H. : Sights for use in bomb or mail dropping from aircraft [17.68%]
Patent:GB137268 08.01.1920 Buffard, Charles Francois (P) : Improvements in or relating to traffic control and ticket systems for use therein [17.69%]
Patent:GB138077 18.04.1914 Teetor, M. Teetor Co. : Type Wheel Machines [18.74%]
Patent:GB138097 20.01.1919 Odhner (P) Aktiebolaget : Multiplying and Dividing Apparatus [16.75%]
Patent:GB139201 09.09.1920 Blaustein, Joseph (P) : Improvements in calculating machines [17.25%]
Patent:GB139202 09.09.1920 Blaustein, Joseph (P) : Adding and subtracting apparatus [16.19%]
Patent:GB139203 03.03.1921 Blaustein, Joseph (P) : Improvements in Calculating Machines [16.91%]
Patent:GB139477 23.06.1921 Liedstrand, Karl Emil Leonard (P) : Improvements in or relating to machines for summing up numerical data [17.83%]
Patent:GB140363 20.03.1919 Fuller, Frederick (P) Remington Rand (P) : Differentially moved Indicators [17.53%]
Patent:GB140441 28.04.1921 Le Sort, Henri Thomas Marie (P) : A machine for solving spherical triangles [17.61%]
Patent:GB140442 18.03.1919 Le Sort, H. T. M. : Modifying Scale [16.94%]
Patent:GB141012 03.03.1921 Pein, E. J. von NCR (P) : Improvements in Cash Registers. [16.25%]
Patent:GB142113 17.03.1921 Isnow, D. A; Altschuler, J. Kodak (P) Ltd : An improved method of and apparatus for numbering or identifying kinematograpy films [17.16%]
Patent:GB142114 21.04.1921 Altschuler, J. Kodak (P) Ltd : Improvements in or relating to apparatus for numbering kinematograph films [28.25%]
Patent:GB142436 03.02.1921 Pein, E. J. von NCR (P) : Improvements in printing mechanism for cash registers [17.88%]
Patent:GB142625 02.04.1919 Livesey, F. J. Everett and Co. : Adding and Subtracting Apparatus [29.57%]
Patent:GB143233 14.05.1919 Odhner, Valentin Jakob (P) : Transfer Mechanism [18.23%]
Patent:GB143251 11.08.1921 Schildt, Wilhelm : Improvements in and relating to calculating machines of the pin wheel and cam disc type [18.89%]
Patent:GB143559 23.12.1920 Trinks, Franz (P) : Improvements in or relating to calculating machines [18.18%]
Patent:GB143631 26.02.1919 Thompson, S. P. : Calendars and Date Indicators [40.83%]
Patent:GB143884 28.05.1919 Trinks, Franz (P) : Multiplying and Dividing Apparatus [16.42%]
Patent:GB144538 07.03.1919 Haddan, Alfred John Henry (P) NCR (P) : Machines for writing on Books [17.17%]
Patent:GB144650 06.06.1919 Julius, G. A. : Wheel Machines for Printing Tickets [16.14%]
Patent:GB144685 07.04.1921 Fed Adding Machine Corp : Improvements in printing mechanism for calculating machines [16.15%]
Patent:GB145509 19.08.1918 Optische Anstalt Goerz (P) AG : Transfer Mechanism [16.60%]
Patent:GB145510 31.03.1921 Mairich, Hans (P) : Improvements in apparatus for registering the consumption of motor spirit and the like [18.13%]
Patent:GB146046 08.07.1920 Glover , Albert William (P) George Glover & Co Ltd : Improvements in gas meter indicators [6.53%]
Patent:GB146273 24.10.1921 Optische Anstalt C. P. Goerz (P) : Improvements in and relating to keyboard setting mechanism for adding-machines [17.46%]
Patent:GB146285 28.12.1921 Rauchwetter, Franz (P) : Improvements in and relating to item printing arrangements for calculating machines [18.09%]
Patent:GB146382 03.10.1921 , J.W. Internat Time Recording Comp. : Improvements relating to machines for compiling statistics by means of perforated cards [17.08%]
Patent:GB146392 25.02.1918 Ammann, O. : Computing Scales for Gunnery Calculations [16.36%]
Patent:GB146438 05.12.1921 Abel, August (P) : Monetary item subtracting and recording apparatus for use in issuing cheques. [18.86%]
Patent:GB146440 28.07.1921 Pestourie, Pierre (P) : Improvements in or relating to Odometers. [17.37%]
Patent:GB146884 02.06.1921 Trinks, Franz (P) : Multiplying and Dividing Apparatus [18.64%]
Patent:GB146885 22.11.1917 Trinks, Franz (P) : Capacity Signals for the Totalizing Counters of Calculating Machines [14.85%]
Patent:GB146886 09.12.1917 Trinks, Franz (P) : Capacity Signals for the Totalizing Counters of Calculating Machines [16.03%]
Patent:GB146893 15.10.1918 Optische-Anstalt C. P.Goerz (P) Akt.-Ges. : Printing Totals and Sub Totals [17.58%]
Patent:GB146948 19.09.1921 Bloch, Georg (P) Bloch (P) : Improvements in calculating apparatus [16.48%]
Patent:GB147111 20.01.1921 Trinks, Franz (P) : Improvements in line-spacing mechanism for calculating machines [18.25%]
Patent:GB147112 06.10.1921 Trinks, Franz (P) : Improvements in calculating machines [17.49%]
Patent:GB147113 29.09.1915 Trinks, Franz (P) : Adding and Subtracting Apparatus [16.79%]
Patent:GB147114 02.06.1921 Trinks, Franz (P) : Improvements in calculating machines [16.91%]
Patent:GB147115 12.05.1921 Trinks, Franz (P) : Improvements in calculating machines [15.88%]
Patent:GB147139 05.05.1921 Thun, Hermann (P) : Surface measuring machine particularly for leather [16.33%]
Patent:GB147467 26.06.1915 Trinks, Franz (P) : Multiplying and Dividing Apparatus [18.47%]
Patent:GB147468 19.07.1915 Schaller, Carl (P) : Multiplying and Dividing Apparatus [18.09%]
Patent:GB147469 17.06.1915 Schaller, Carl (P) : Multiplying and Dividing Apparatus [18.56%]
Patent:GB147477 08.12.1921 Reisser, Alexander (P) : Multiplying and Dividing Apparatus [17.29%]
Patent:GB147751 07.07.1915 Schaller, Carl (P) : Multiplying and Dividing Apparatus [16.08%]
Patent:GB147762 04.08.1921 Grimme Natalis (P) : Improvements in or relating to calculating machines [17.62%]
Patent:GB147763 08.03.1917 Grimme, Natalis u. Co. (P) : Adding and Subtracting Apparatus [18.56%]
Patent:GB147764 05.05.1921 Grimme Natalis (P) : Improvements in or relating to calculating machines [21.05%]
Patent:GB147765 10.10.1921 Trinks, Franz (P) : Adding Apparatus [16.41%]
Patent:GB147766 07.07.1921 Trinks, Franz (P) : Multiplying and Dividing Apparatus, Zeroizing Mechanism [16.91%]
Patent:GB147835 10.10.1921 Grimme Natalis (P) : Improvements in or relating to calculating machines [16.78%]
Patent:GB147841 22.06.1915 Schaller, Carl (P) : Multiplying and Dividing Apparatus [17.66%]
Patent:GB147883 10.10.1921 Moire, Paul (P) : Improvements in and relating to counting apparatus [16.02%]
Patent:GB148166 28.04.1921 Werkstätten für Prazisions-Mechanik und Optik C. Bamberg : Improvements in or relating to instruments for assisting in the Measurement of Long Base Distances [18.25%]
Patent:GB148292 09.01.1922 Turck, Joseph Abraham Valentine (P) Felt und Tarrant (P) : Improvements in or connected with Calculating machines [15.99%]
Patent:GB148376 10.10.1921 Brasseur, E. J. A.B. Dick Company : Apparatus for counting the number of sheets passing into a rotary duplicator or like printing machine [16.20%]
Patent:GB148455 10.07.1920 Kübler, Carl, Carl : Calculating Apparatus [16.83%]
Patent:GB148770 20.01.1921 Mouren, Lucien Joseph Louis (P) : Apparatus for mechanically solving spherical triangles [19.64%]
Patent:GB149285 06.01.1921 William Walter Lasker : Improvements in and relating to stop motions and clutch mechanism for calculating apparatus, machines for automatically compiling, recording [17.47%]
Patent:GB149286 28.04.1921 William Walter Lasker : Improvements in and relating to calculating apparatus, more especially adapted for use in machines for automatically compiling, recording, an [16.14%]
Patent:GB149287 03.02.1921 William Walter Lasker : Improvements in and relating to printing mechanism for calculating apparatus, machines for automatically compiling, recording, and reckoning [17.08%]
Patent:GB149672 05.05.1921 Krupp (P) AG : Improvements in machines for measuring areas of leather or the like [16.76%]
Patent:GB150351 25.08.1921 Mang, Gerard (P) & Fournier, Louis (P) : Calculator [17.57%]
Patent:GB150685 21.11.1921 Krupp (P) AG : Improvements in and relating to surface measuring machines [18.90%]
Patent:GB150689 30.06.1921 Krupp (P) AG : Improvements in or relating to area measuring machines particularly intended for the measurement of leather [16.94%]
Patent:GB150735 28.04.1919 Pein, E. J. von NCR (P) : Cash Registers [17.54%]
Patent:GB151263 06.01.1921 Krupp (P) AG : Improvements in and relating to apparatus for the measurement of plane surfaces [17.04%]
Patent:GB151908 07.10.1920 Leyland, John Lawton (P) : Improvements in shaft couplings [9.12%]
Patent:GB152417 12.07.1919 Harper, John : Improvements in tea-pots and such like vessels [12.55%]
Patent:GB152630 24.02.1921 Morse, R. V. Morse Instrument Company Inc : Improvements relating to fuse setting apparatus for anti-aircraft artillery [17.37%]
Patent:GB152640 29.12.1920 Peirce, John Royden (P) : Statistical data representation systems and co-operating differential mechanism for perforated record card controlled statistical machines. [16.51%]
Patent:GB152682 21.10.1919 Krupp (P) AG : Improvements in and relating to surface measuring apparatus [15.84%]
Patent:GB153326 07.04.1921 State of France : Improvements relating to the aiming of anti-aircraft guns [17.15%]
Patent:GB153868 30.06.1921 Krupp (P) AG : Improvements in and relating to surface measuring machines [19.88%]
Patent:GB154573 26.11.1919 Price, F. : Tabular Calculators [16.34%]
Patent:GB154603 27.03.1922 Turck, Joseph Abraham Valentine (P) Felt und Tarrant (P) : [17.21%]
Patent:GB154607 09.09.1918 Krems, O. : Multiplying and Dividing Apparatus [17.45%]
Patent:GB154608 18.10.1918 Krems, O. : Multiplying and Dividing Apparatus [20.84%]
Patent:GB156052 06.01.1921 Burroughs (P) Adding Machine Co : Improvements in adding and listing machines [38.13%]
Patent:GB156204 21.04.1921 William Walter Lasker : Improvements in and relating to transfer or carrying-over mechanism for calculating apparatus, machines for automatically compiling, recordin [17.24%]
Patent:GB156311 29.12.1920 Frank Edward Guy : Improvements in and relating to calculating machines [6.42%]
Patent:GB156715 07.01.1921 Rechnitzer, Alexander (P) Autarit (P) GMBH : Calculating-machine [18.13%]
Patent:GB162259 07.03.1922 Fed Adding Machine Corp : Improvements in motor driven calculating machines [17.19%]
Patent:GB163983 08.06.1922 Louis Frederic Amez Droz : Copy carrier for writing machines, adding machines and the like [16.40%]
Patent:GB167099 04.08.1921 August Straub, Andreas Hochstrasser : Improvements in or relating to sliding rules [7.07%]
Patent:GB168311 16.11.1922 Tabulating Machine Co : Improvements in transfer mechanism for totalizers of calculating and other registering machines [18.01%]
Patent:GB169178 09.01.1922 Reisser, Alexander (P) : Improvements in the transfer mechanism of calculating machines [16.13%]
Patent:GB172020 28.12.1921 Rauchwetter, Franz (P) : Improvements in item and total printing arrangements for adding machines [17.25%]
Patent:GB172640 11.01.1923 Optische Anstalt C. P. Goerz (P) : Improvements in and relating to electromotive drives for calculating machines [17.45%]
Patent:GB172990 28.12.1921 Adolph Edward Vidal : Improvements in item and total printing arrangements for calculating machines [16.27%]
Patent:GB174369 21.12.1922 Daemen, Victor (P) : Improvements in logarithmic computing apparatus [16.93%]
Patent:GB175064 10.02.1922 William James Smith Bliss Co : Improvements in Slide Rules [7.83%]
Patent:GB177040 23.03.1922 Grand Rapids Show Case Company : A cloth measuring or computing device [6.84%]
Patent:GB179933 14.09.1922 Augustin, Wilhelm (P) Bing (P) Werke : Improvement in or connecting with calculating machines [16.21%]
Patent:GB180695 27.08.1923 Leon Appoullot : Improvements in or relating to calculating apparatus [17.40%]
Patent:GB183127 16.08.1923 Maschinenbau Fritz Koch Bing (P) Werke : Improvements in or connecting with calculating machines [16.94%]
Patent:GB187236 02.08.1923 Alphonse Hippolyte Claeys : Improvements in and relating to squares provided with scales for any kind of calculations [10.08%]
Patent:GB189504364 22.02.1896 Schneider, Edmund (P) : An Improved Calculating Apparatus [4.22%]
Patent:GB190008793 14.07.1900 Smith, Marmaduke Valentine (P) : Improved Date Calculator [26.58%]
Patent:GB190019018 27.02.1901 Juliet Hunt : Improvements in Date Calculators or Calendars [29.66%]
Patent:GB190101736 11.05.1901 Labofish, Charles Shachon (P) : Improvements in or relating to Calculating Devices Particularly Applicable for Use in Connection with Typewriters [17.13%]
Patent:GB190404010 30.06.1904 Moehlenbruck, Henri (P) : Improvements in Calculating Apparatus [19.28%]
Patent:GB190412021 07.07.1904 Mugnier, Francois (P) : Improvements in and relating to Calculating Apparatus [16.79%]
Patent:GB190420274 20.10.1904 Rouget, Jules Rene (P) : Improvements in and connected with Calculating Machines [16.90%]
Patent:GB190511975 22.02.1906 Johanson, Adolf Magnus (P) und Hultman, Ivar (P) : Calculating Machine [19.60%]
Patent:GB190512088A 11.12.1905 Dickinson, Herbert (P) : Improvements in Adding or Counting Machinery [4.09%]
Patent:GB190517640 15.02.1906 Kaiser, Gabriel (P) : Improvements in and relating to Adding Machines [17.71%]
Patent:GB190719094 17.09.1908 McFarland, Charles Numan (P) : Improvements in or relating to Adding Machines [17.40%]
Patent:GB190726170 21.05.1908 Bürk, Richard : An Improved Selective Manual Operating Mechanism for Calculating Machines [18.28%]
Patent:GB190727269 09.10.1908 Putnam, George Bowers (P) : Improvements in or relating to Adding Machines [17.57%]
Patent:GB190727446 06.08.1908 Bollinger, Alexander (P) und Landry, Alcide (P) und Landry, Eugen (P) : Improvements in or relating to Calculating Machines [19.49%]
Patent:GB190727481 14.05.1908 Trinks, Franz (P) : Improvements in Calculating Machines [18.41%]
Patent:GB190800087 06.08.1908 Schuster, Ernst (P) : Improvements in and relating to Zeroizing Apparatus for Calculating Machines [16.33%]
Patent:GB190809224 08.10.1908 Trinks, Franz (P) : Improvements in Calculating Machines [16.04%]
Patent:GB190816192 25.03.1909 Meilicke, Carl Arno (P) : Improvements in Calculating Machines [7.15%]
Patent:GB190816212 17.12.1908 Meilicke, Carl Arno (P) : Improvements in Calculating Machines [18.50%]
Patent:GB190820467 27.05.1909 Giuliani, Vittore (P) : Improved Calculating Machine [17.36%]
Patent:GB190822435 18.02.1909 Trinks, Franz (P) : Improvements in Calculating Machines [17.78%]
Patent:GB190823895 11.02.1909 Trinks, Franz (P) : Improvements in Calculating Machines [18.78%]
Patent:GB190902119 30.09.1909 Vincent, Jesse Gurney (P) : Improvements in or relating to Adding Machines [17.03%]
Patent:GB190903075 13.01.1910 Vincent, Jesse Gurney (P) : Improvements in or relating to Adding Machines [16.34%]
Patent:GB190905214 24.02.1910 Bordt, Adolf (P) : Adding Machine [17.00%]
Patent:GB190906999 23.03.1910 Vincent, Jesse Gurney (P) : Improvements in or relating to Adding Machines [17.21%]
Patent:GB190907109 28.10.1909 Meilicke, Carl Arno (P) : Improvements in Calculating Machines [16.28%]
Patent:GB190915409 30.09.1909 Vuillemin, Jules (P) : An Improved Method of, and Means for, Totalizing and Calculating [17.25%]
Patent:GB190919954 16.12.1909 Jahnz, Erwin (P) : An Improvement in Calculating Machines [19.29%]
Patent:GB190920045 14.07.1910 Vincent, Jesse Gurney (P) : Improvements in or relating to Adding Machines [18.10%]
Patent:GB190921023 03.03.1910 Jahnz, Erwin (P) : Improvements in and connected with Calculating Machines [18.61%]
Patent:GB190922464 29.09.1910 White, Nelson (P) und Vincent, Jesse Gurney (P) : Improvements in or relating to Adding and Listing Machines [17.76%]
Patent:GB190922862 10.12.1909 Walter Henry Browning British Adding Machine : Improvements in Apparatus for Adding or Calculating [15.96%]
Patent:GB191001217 15.09.1910 Bechtolsheim, Max (P) : An Improved Counting and Calculating Apparatus [16.88%]
Patent:GB191003516 10.11.1910 Benner, Russell Eugne (P) und Vincent, Jesse Gurney (P) : Improvements in or relating to Adding and Listing Machines [18.18%]
Patent:GB191004550 23.02.1911 Rechnitzer, Alexander (P) : Improvements in or relating to Calculating Machines [18.41%]
Patent:GB191004991 17.11.1910 Gooch Claiborne Watts : Improvements in or relating to Adding and Listing Machines [16.80%]
Patent:GB191020636 08.06.1911 Quentell, William Prehn (P) : Improvements in Adding Machines [16.87%]
Patent:GB191021170 23.03.1911 Quentell, William Prehn (P) : Improvements in Adding Machines [16.30%]
Patent:GB191021412 19.01.1911 Klein & Seitter : Improvements in or relating to Transfer Mechanism for Calculating Machines [15.78%]
Patent:GB191021602 20.07.1911 Bordt, Adolf (P) : Improvements in Adding Machines [17.13%]
Patent:GB191023061 16.03.1911 Godeau, Pierre Louis Marie (P) Boyer Antide : Improvements in Calculating and Price Indicating Machines [16.89%]
Patent:GB191024662 02.02.1911 Evans, Walter Jenkin (P) : Improvements in Day and Date Calculating Apparatus [17.04%]
Patent:GB191024813 09.03.1911 Biane, Rufin (P) und Lourau, Valentin (P) : A Calculating Machine for Scoring and Printing the Points and Results in the Game of Bridge [15.63%]
Patent:GB191030391 14.12.1911 Barrett, Glenn (P) J. : Improvements in Calculating Machines [17.04%]
Patent:GB191114918 14.12.1911 Schuster, Ernst (P) : Improvements in or relating to Calculating Machines [16.84%]
Patent:GB191115908 04.07.1912 Rechnitzer, Alexander (P) : Improvements in or relating to the Setting and Differential Actuating Mechanisms of Calculating-machines [16.72%]
Patent:GB191118734 11.04.1912 vormals Seidel und Naumann (P) AG : Adjusting Device for the Paper Carriage of Calculating Machines Provided with Printing Mechanism [15.56%]
Patent:GB191118735 09.05.1912 vormals Seidel und Naumann (P) AG : Calculating Machines of the Thomas Type [16.84%]
Patent:GB191118736 18.04.1912 vormals Seidel und Naumann (P) AG : Total Printing Device for Thomas Calculating Machines Provided with Printing Mechanism [16.09%]
Patent:GB191120596 05.09.1912 Bordt, Adolf (P) : Improvements in Printing Mechanism for Adding Machines [17.54%]
Patent:GB191129217 18.07.1912 Trinks, Franz (P) : Improvements in Calculating Machines [9.05%]
Patent:GB191204282 24.10.1912 vormals Seidel und Naumann (P) AG : Means for the Transfer of Tens in Thomas Calculating Machines [16.58%]
Patent:GB191205570 27.02.1913 Bernovits, Victor (P) : Calculating Machine [16.31%]
Patent:GB191209013 16.01.1913 vormals Seidel und Naumann (P) AG : Counting Mechanism for Chain Calculating Machines [17.57%]
Patent:GB191210148 29.04.1913 Piscicelli Taeggi, Roberto (P) : Improvements in or relating to Calculating Machines [17.00%]
Patent:GB191210604 14.11.1912 Trinks, Franz (P) : Improvements in Inter-locking Devices for Calculating Machines [17.13%]
Patent:GB191210855 28.11.1912 Kerr David Smith : Improvements in Date Calculating Devices [28.26%]
Patent:GB191214853 14.11.1912 Avery, Charles Henry (P) : Calculating Apparatus [18.23%]
Patent:GB191223304 13.10.1913 Knecht, Benno (P) : Improvements in or relating to Calculating Machines [21.77%]
Patent:GB191223665 28.08.1913 Grimme Natalis (P) : Improvements in Zeroizing Device for Calculating Machines [17.08%]
Patent:GB191226772 26.11.1913 Felt, Dorr E. (P) : Improvements in and relating to Calculating Machines [17.03%]
Patent:GB191228850 15.12.1913 vormals Seidel und Naumann (P) AG : Improvements in Calculating Machines [17.96%]
Patent:GB191229020 16.10.1913 Trinks, Franz (P) : Improvements in Setting Mechanism for Calculating Machines [16.48%]
Patent:GB191301669 24.07.1913 Augustin Wilhelm : Improvements in Calculating Machines [17.28%]
Patent:GB191306951 20.03.1914 Aktiebolaget Adderator (P) : Improvements in or relating to Calculating or like Machines [17.27%]
Patent:GB191307731 27.11.1913 Trinks, Franz (P) : A Setting Mechanism for Calculating Machines [17.38%]
Patent:GB191309877 23.04.1914 Bauchwitz, Richard (P) : Improvements in Registering Mechanism for Cash Registers, Calculating Machines and Registering and the like Apparatus [16.78%]
Patent:GB191316036 11.09.1914 Felt, Dorr E. (P) : Improvements in and relating to Calculating Machines [16.43%]
Patent:GB191319300 16.07.1914 Trinks, Franz (P) : Improvements in and relating to Calculating Machines [17.09%]
Patent:GB191319815 10.06.1915 Trinks, Franz (P) : Improvements in Calculating Machines having Revolutions Counting Mechanisms [17.45%]
Patent:GB191320372 16.07.1914 Faguer, Louis Marie (P) : Improvements in or relating to Printing or Perforating Adding Machines [16.31%]
Patent:GB191321512 16.10.1913 Trinks, Franz (P) : Improvements in Setting Mechanism for Calculating Machines of the Pin-wheel and Cam-disc Type [16.18%]
Patent:GB191323575 24.06.1915 Bunzel Delton (P) Werk : Improvements in Calculating Machines [16.14%]
Patent:GB191323689 24.06.1915 Trinks, Franz (P) : A Tens Transfer Mechanism for Counting Mechanisms of Calculating and like Machines [17.51%]
Patent:GB191323816 16.04.1914 Teetzmann, and Co (P) : Improvements in or relating to Locking and Releasing the Setting Slides in Calculating Machines [16.91%]
Patent:GB191324064 24.06.1915 Bunzel Delton (P) Werk : Improvements in Calculating Machines [17.13%]
Patent:GB191324381 24.06.1915 Bunzel Delton (P) Werk : Improvements in Calculating Machines [15.96%]
Patent:GB191400037 22.07.1915 Trinks, Franz (P) : Improvements in Calculating Machines [17.02%]
Patent:GB191400869 15.07.1915 Wanderer (P) Werke vormals Winklhofer : Improvements in and relating to Calculating Machines [15.75%]
Patent:GB191401326 29.07.1915 Rasmussen, Carl (P) : Improvements in and relating to Calculating Machines [16.20%]
Patent:GB191401327 15.07.1915 Rasmussen, Carl (P) : Improvements in and relating to Calculating Machines [16.56%]
Patent:GB191401782 10.06.1915 Pivoda, Franz (P) : Improvements in Calculating-apparatus for Determining Date Intervals [16.22%]
Patent:GB191402007 29.07.1915 Schaller, Carl (P) : Improvements in and relating to Calculating Machines [17.79%]
Patent:GB191404000 01.07.1915 AEG (P) : Mounting the Pivots for Writing, Calculating and similar Machines [16.81%]
Patent:GB191407963 24.06.1915 Trinks, Franz (P) : Improvements in Transfer Mechanism for Calculating and like Machines [17.88%]
Patent:GB191408867 16.04.1914 Trinks, Franz (P) : Improvements in Setting Mechanisms for Calculating Machines of the Pin-wheel and Cam-disc Type [16.81%]
Patent:GB191417274 15.04.1915 Wheatley Frederick Yeld : Parturition Calculator [22.33%]
Patent:GB191419145 29.11.1915 Enberg, John Christer (P) : Improvements in or relating to Calculating Machines [18.51%]
Patent:GB191419146 29.11.1915 Enberg, John Christer (P) : Improvements in or relating to Key Mechanism for Calculating Machines, Cash Registers, and the like [16.88%]
Patent:GB191505953 20.01.1916 Mays Accounting Machine Company : Improvements in or relating to Calculating Machines [17.90%]
Patent:GB191509738 03.07.1916 Simone Michele Guglielmo De : Improvements in Calculating Apparatus [17.77%]
Patent:GB191513759 08.06.1916 Coddington, Fitzherbert John; Livens, George Henry : Improvements in Proportional Calculators [4.50%]
Patent:GB192282 01.02.1923 Metcalfe, Robert Munkman (P) : Planimeter [6.46%]
Patent:GB192434 01.02.1923 Britten, Edwin (P) : Improvements in or relating to calculating machines [5.91%]
Patent:GB194418 14.03.1923 Fairburn, Charles Edward (P) und Harper, Frederic Arthur (P) English Electric Co Ltd : Improvements relating to Slide Rules [4.10%]
Patent:GB195286 29.03.1923 Albert John Anido : Improvements in and connected with Slide Rules and the like [4.22%]
Patent:GB195644 29.05.1924 Henri Thomas Marie Le Sort : Improvements in and relating to calculating apparatus for evaluating expressions involving a number of variables [16.65%]
Patent:GB196589 16.08.1923 A W Faber Castell (P) Bleistift Fa : Improvements in Slide Rules [5.62%]
Patent:GB210265 31.01.1924 Shirley Brooks Ralston : Slide-rule or computing apparatus for calculating ship stability [4.78%]
Patent:GB211089 07.02.1924 Odhner, Valentin Jakob (P) : Improvements in transfer mechanisms for calculating machines [6.86%]
Patent:GB211137 06.05.1925 Collett and Co As O : Improvements in or relating to calculating machines [17.13%]
Patent:GB211623 28.02.1924 Anders Josef Ostlind, Karl Gustav Hagstrom : Improvements in devices for determining stop or diaphragm opening and or the focus, minimum distance and maximum distance of range in photographic cameras [9.33%]
Patent:GB212538 07.08.1924 Carl Eckardt und Heino Bost : Improved means for carrying the tens in calculating machines [16.94%]
Patent:GB213238 14.08.1924 Frappant Ag Fuer Praez S Und F : Improvements in Slide Rules or the like calculators [16.56%]
Patent:GB213550 22.01.1925 Grimme Natalis (P) : Improvements in calculating machines [17.42%]
Patent:GB213553 04.09.1924 : [12.46%]
Patent:GB214142 17.04.1924 Lyadoff, Peter (P) : Improvements in or relating to calculating apparatus [4.51%]
Patent:GB214571 10.11.1924 British Tabulating (P) Mach Co Ltd : Improvements in or relating to counters for record+card+controlled [16.95%]
Patent:GB214604 30.10.1924 J B Soellner Nachf Reisszeugfa : Improvements in Slide Rules [15.05%]
Patent:GB216365 29.05.1924 Brandstetter, Georg (P) Geobra (P) : Improvements in Slide Rules [8.30%]
Patent:GB217203 07.05.1925 Carl Lindstroem Ag : Improvements in and relating to printing mechanism for calculating machines [17.57%]
Patent:GB218705 09.07.1924 Perpete, Georges Victor Lambert (P), Puttemans, Hubert Auguste (P) : Improvements in or relating to adding machines [8.33%]
Patent:GB223583 09.07.1925 Rudin, Karl Viktor (P) : Improvements in tens transfer mechanism for calculating machines [18.69%]
Patent:GB224244 27.03.1925 Shipley, Bernis (P) : Improvements in keyboard and differential mechanism for cash registers or calculating machines [16.39%]
Patent:GB224549 07.04.1926 Bernhard Weiner : Improvements in and relating to calculating machines [6.81%]
Patent:GB231160 17.09.1925 Erik Fagerholm : Improvements in calculating apparatus [17.27%]
Patent:GB231868 29.10.1925 NCR (P) : Improvements in automatic ribbon reversing mechanism for cash registers, calculating machines and the like [17.29%]
Patent:GB232150 16.04.1925 Fuss, Herbert (P) : Improvements in or relating to logarithmic calculating apparatus [13.37%]
Patent:GB232192 28.05.1925 Trinks, Franz (P) : Improvements in calculating machines [16.36%]
Patent:GB232254 08.04.1926 Trinks, Franz (P) : Improvements in calculating machines [12.10%]
Patent:GB232442 23.04.1925 Rudolf Uhlich : Improvements in Slide Rules [7.48%]
Patent:GB232577 25.03.1926 Grimme Natalis (P) : Improvements in tens transfer devices for calculating machines of the pin wheel and cam disc type [13.62%]
Patent:GB233668 20.08.1925 Krupp (P) AG : Improvements in differential actuating mechanisms for calculating machines [17.66%]
Patent:GB236165 24.09.1925 Franziska Joksch : Improvements in and connected with tabular calculating apparatus for use with weighing apparatus [16.47%]
Patent:GB241177 25.02.1926 Friden, Carl Mauritz Fredrick (P) : Improvements in or relating to calculating machines [16.37%]
Patent:GB241867 01.07.1926 Johannes Fischer : Improvements in automatic weighing balances combined with devices for calculating the price of the material weighed [16.29%]
Patent:GB241908 17.06.1926 : [13.60%]
Patent:GB241923 31.12.1925 British Thomson-Houston Co., Ltd : Improvements in calculators [16.81%]
Patent:GB244893 31.12.1925 Edward Rogers : Improved price+computing apparatus [8.30%]
Patent:GB246134 15.01.1925 Bergmann, Jean (P) : Improvements in Calculating Devices. [15.95%]
Patent:GB248620 11.03.1926 Francesco Poggi und Umberto Emanuele : Improvements in or relating to calculating devices [7.11%]
Patent:GB250258 01.07.1927 British Tabulating (P) Mach Co Ltd : Improvements in or relating to means for producing punched records for use in calculating apparatus [17.00%]
Patent:GB252549 03.06.1926 James Weir French Barr and Stroud Ltd : Improvements in multiplying gear particularly for use in gunnery calculating apparatus [7.03%]
Patent:GB254255 08.04.1927 Optische Anstalt C. P. Goerz (P) : Improvements in or relating to keyboard mechanism especially adapted for use with calculating machines [16.81%]
Patent:GB255471 02.12.1926 Simon Siegfried Egger Hansen : Improvements in or relating to weighing scales [17.01%]
Patent:GB256223 01.09.1927 Siemens (P) : Method of and means for controlling adding, sorting, statistical and like machines [17.38%]
Patent:GB261658 25.11.1926 Emil Kleinschmidt : Type-cleaning device for typewriters, calculating machines and the like [11.03%]
Patent:GB263097 12.01.1928 Burroughs (P) Adding Machine Co : An improved platen mechanism and ribbon feed mechanism for calculating machines [16.25%]
Patent:GB265136 26.08.1927 Burroughs (P) Adding Machine Co : An improved keyboard for calculating machines [16.31%]
Patent:GB265137 26.08.1927 Burroughs (P) Adding Machine Co : Improvements in calculating machine mechanisms [19.21%]
Patent:GB265140 26.10.1927 Burroughs (P) Adding Machine Co : Improvements in or relating to printing mechanism for calculating machines [17.45%]
Patent:GB266350 15.05.1927 Simon Siegfried Egger Hansen : Improvements in computing devices for weighing scales [17.94%]
Patent:GB270341 20.05.1927 Reisser, Alexander (P), Reder, Rudolf (P) : Improvements relating to the transfer arrangements of calculating machines [12.34%]
Patent:GB270343 20.05.1927 Reisser, Alexander (P) Reder, Rudolf (P) : An Improved Calculating Machine [22.09%]
Patent:GB275923 12.08.1926 Schneider et Cie : An Improved Apparatus for the Control of Firing against Aerial Targets [17.43%]
Patent:GB279356 27.10.1927 Sergius Tanton : Apparatus for converting into the decimal system values calculated in [7.96%]
Patent:GB280177 26.04.1928 Alexander Von Castell Ruedingh : Improvements in Slide Rules [13.16%]
Patent:GB280204 09.02.1928 Paul Jellinek und Fritz Beer : An improved apparatus for calculating and measuring purposes [16.55%]
Patent:GB280891 26.01.1928 Rheinmetall (P) (Rheinische Metallwaaren und Maschinenfabrik) : Improvements relating to calculating machines [18.31%]
Patent:GB283003 05.01.1928 Thomas Davidson Cosans Eyre And Spottiswoode Bible Wa : New or improved protector for the cursors of Slide Rules [6.59%]
Patent:GB284445 02.02.1928 Black, John (P) : Slide rule for paper makers [7.14%]
Patent:GB287548 21.06.1928 Tauschek, Gustav (P) : Improvements relating to record-card-controlled statistical and calculating machines [16.67%]
Patent:GB288580 04.07.1929 Goldberg, Emanuel (P) Zeiss Ikon Ag : Improvements in or relating to adding, sorting, statistical and like machines [16.50%]
Patent:GB289382 24.07.1929 Shipley, Bernis (P) NCR (P) : A new or improved method of operating an adding and subtracting totalizer and mechanism for carrying out the method [16.42%]
Patent:GB290181 01.11.1928 Jean Ansermot : Apparatus for measuring surfaces [12.33%]
Patent:GB290897 24.05.1928 Karl Albin Abraham Johansson : Improvements in and relating to means for mounting type-writers, calculating machines, and other office machines on tables or desks [6.88%]
Patent:GB292223 14.06.1928 Jonas Harald Faxen : Improvements in and relating to calculating discs [6.23%]
Patent:GB294121 28.03.1929 Benevenuto Schiffo : Improvements relating to date calculators [29.66%]
Patent:GB295595 18.10.1928 Rheinmetall (P) (Rheinische Metallwaaren und Maschinenfabrik) : Improvements relating to calculating machines [16.99%]
Patent:GB295699 30.04.1929 Burroughs (P) Adding Machine Co : Improvements in or relating to printing mechanism for calculating machines [16.00%]
Patent:GB296092 26.08.1927 Leslie, P. R. : Improvements regarding to the Mechanical Computation and Recording of Labour Costs [15.83%]
Patent:GB296351 27.02.1930 Marcel Jacob : Improvements in or relating to calculating machines [17.34%]
Patent:GB299317 24.02.1930 Kraut, Wilhelm (P) : Improvements in and relating to combined weighing, calculating and recording apparatus [16.46%]
Patent:GB302237 11.03.1930 British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines [17.53%]
Patent:GB303062 24.03.1930 British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines [18.31%]
Patent:GB303483 03.07.1930 Siemens (P) : Improvements in or relating to calculating machines [17.87%]
Patent:GB303517 04.04.1930 British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines [19.11%]
Patent:GB304599 22.04.1930 British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines [16.97%]
Patent:GB305579 07.02.1928 Herzstark, Samuel (P) : Adding and subtracting apparatus [16.60%]
Patent:GB307025 28.05.1930 Bryce, James (P) British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines [16.82%]
Patent:GB307513 12.12.1929 Askania (P) Werke Ag : Improvements in or relating to calculating devices [19.04%]
Patent:GB308768 22.05.1930 Marcel Jacob : Improvements in or relating to record controlled calculating machines [16.34%]
Patent:GB308977 20.03.1930 British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines [17.92%]
Patent:GB311414 03.04.1930 Denis Maurice Tissier : Calculators for use in betting [13.04%]
Patent:GB313128 07.07.1928 C. P. Goerz (P) Optische Anstalt : Apparatus for mechanically solving right-angled triangles [17.06%]
Patent:GB313156 15.10.1930 Askania (P) Werke AG : Improvements in or relating to calculating devices [19.28%]
Patent:GB313157 15.10.1930 Askania (P) Werke AG : Improvements in or relating to calculating devices [18.35%]
Patent:GB314026 19.09.1930 Hofgaard Remington (P) Corp : Improvements in or relating to calculating machines [17.35%]
Patent:GB314609 04.07.1929 Michael Ewgenjewitchem Podtjag : Cylindrical slide rule [6.54%]
Patent:GB315267 01.01.1931 Young, Archer Everett : Improvements in or relating to method of and apparatus for indicating, recording and computing certain manifestations, such as pressure involved in meters [16.95%]
Patent:GB317014 08.12.1930 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating or accounting machines [16.46%]
Patent:GB317057 30.10.1930 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating or the like machines [18.18%]
Patent:GB317090 09.02.1931 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating or accounting machines [17.25%]
Patent:GB317822 31.07.1930 Tauschek, Gustav (P) : Improvements in the typewriting mechanism of tabulating machines, calculating machines and the like [15.78%]
Patent:GB318024 29.08.1929 : Ellipsograph [9.23%]
Patent:GB318150 26.06.1930 Fernand, Joseph Bourgeois (P) : Toy slide rule [16.75%]
Patent:GB319699 31.07.1930 Knotz, Alois (P) : Feeding-device for the paper strip of adding machines and cash registers [15.19%]
Patent:GB325357 20.02.1930 Ruxton Multi Vider Corp : Improvements in or relating to combined calculating and writing instruments [15.97%]
Patent:GB328455 01.05.1930 Harald, Odegaarden (P) : Improvements in or relating to calculating devices [7.59%]
Patent:GB332668 31.07.1930 Julius, George Alfred (P), Julius, Awdry Francis (P) : Method of and means for calculating and indicating the ratio of two variable quantities [16.55%]
Patent:GB335379 25.09.1930 Neil Lawson Lewis and Tylor Ltd : A slide rule for calculating data connected with belting [6.91%]
Patent:GB335904 01.10.1930 Friden, Carl Mauritz Fredrick (P) : Improvements in and relating to calculating machines [16.89%]
Patent:GB336997 23.10.1930 Original Odhner (P) AB : [7.88%]
Patent:GB338038 13.11.1930 Adrema (P) Maschinenbau : Improvements in and relating to an address-printing machine with means for operating a calculating machine [17.08%]
Patent:GB339165 04.12.1930 Fernand, Eugene Cuenoud (P) : Improvements in and relating to means for combining weighing scales or balances with calculating or other auxiliary apparatus [15.80%]
Patent:GB341850 15.01.1931 Tauschek, Gustav (P) : Process and apparatus for setting numerical values or other quantitative magnitudes electromagnetically upon registering and calculating mechanism [17.49%]
Patent:GB343060 09.02.1931 Burroughs (P) Adding Machine Co : Improvements in and relating to calculating or accounting machines [18.03%]
Patent:GB343061 09.02.1931 Burroughs (P) Adding Machine Co : Improvements in and relating to calculating or accounting machines [18.93%]
Patent:GB343323 19.02.1931 Hugo Jung : Improvements in and relating to beads or counters for abacuses [7.42%]
Patent:GB344919 09.03.1931 Siemens (P) : Improvements relating to calculating machines, especially statistical machines, controlled by perforated code cards [16.22%]
Patent:GB345306 20.03.1931 British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating, recording, registering or like machines controlled by perforated records [16.64%]
Patent:GB345967 31.12.1929 Magnus, John Herman (P) Burroughs (P) : Improvements in or relating to Calculating Machines [17.10%]
Patent:GB346447 13.04.1931 Emil Hubert : Improvements in or relating to typing, adding, and like machines [6.33%]
Patent:GB347119 14.04.1931 Age Kalsbeek : Improvements in or relating to record card controlled calculating machines [16.25%]
Patent:GB347938 05.06.1930 Brunsviga (P) : Zeroizing-mechanism [17.32%]
Patent:GB349512 26.05.1931 British Tabulating (P) Mach Co Ltd : Improvements in or relating to punching machines for perforating, and adding the amounts so recorded on, statistical record-cards [15.52%]
Patent:GB350864 18.06.1931 Gilbert Ballance : Improvements in and relating to money calculators [6.73%]
Patent:GB351086 17.04.1929 Bentzel, Frank David (P) Burroughs (P) : Improvements in or relating to Calculating and/or Check writing Machines [16.05%]
Patent:GB351305 25.06.1931 Gesellschaft für elektrische Apparate : Calculating Apparatus for Determining Values Necessary for Directing Firing [15.92%]
Patent:GB351667 12.05.1930 Friden, Carl Mauritz Fredrick (P) Marchant (P) : [16.49%]
Patent:GB352470 30.06.1931 Zeiss, Carl (P) : Improvements in calculating apparatus for transforming co-ordinates [17.84%]
Patent:GB356304 10.09.1931 British Tabulating (P) Mach Co Ltd : Improvements in or relating to statistical or calculating machines [17.37%]
Patent:GB356434 10.09.1931 Sydney Herbert Stelfox : Improvement in the construction of slide+rules [10.21%]
Patent:GB357525 21.09.1931 Oskar Zelenka : Improvements in or relating to automatic calculating devices [17.23%]
Patent:GB357818 01.10.1931 Seemann, Rosa Aloisia (P) : Improvements in Planimeters [8.67%]
Patent:GB358105 05.10.1931 British Tabulating (P) Mach Co Ltd : Improvements in or relating to record-card controlled calculating machines [15.93%]
Patent:GB358212 08.10.1931 Eric Cross : Improvements in or relating to calculating devices [6.56%]
Patent:GB359578 29.10.1931 Beddington,Thomas Alfred Herbert (P) : Totalisator odds calculator [6.98%]
Patent:GB360824 05.11.1931 Accounting and Tabulating Mach : Improvements in printing mechanism for adding machines [15.64%]
Patent:GB360854 11.11.1931 William Muncaster Lovatt : Wind allowance calculator for use in shooting [6.41%]
Patent:GB361017 19.11.1931 Paul Peroti Mercedes (P) Büromaschinen Werke : Improvements in and relating to typewriters, calculating type machines, high speed telegraph machines, type-printing telegraphs, and the like [14.76%]
Patent:GB361863 25.11.1931 Ellis (P) Adding Typewriter Company : Improvements in or relating to paper feeding means for calculating machines, bookkeeping machines and similar machines [15.00%]
Patent:GB363470 06.11.1929 Avery, Harold (P) Marchant (P) : Calculating Machines [16.65%]
Patent:GB364210 07.01.1932 Mercedes (P) Büromaschinen Werke : Improvements in and relating to typewriter calculating machines [16.78%]
Patent:GB366203 04.02.1932 Neander Waldstein : Improvements in electrical calculating apparatus [17.27%]
Patent:GB368254 01.03.1932 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating machines and the like [16.76%]
Patent:GB368991 17.03.1932 Kay Ivar Andersen : Improvements in calculating devices [17.60%]
Patent:GB370053 01.04.1932 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating machines or the like [18.07%]
Patent:GB370099 07.04.1932 Friden, Carl Mauritz Fredrick (P) und Lerch, Gustav (P) Marchant (P) : Improvements in or relating to Calculating Machines. [15.80%]
Patent:GB371447 25.04.1932 George Francis Daly British Tabulating (P) Mach Co Ltd : Improvements in or relating to record-controlled calculating machines [16.32%]
Patent:GB376283 30.06.1932 Isaac Roet : A method and apparatus for the operations of book-keeping calculating composing type-setting, typewriting or the like, by means of signs arra [16.88%]
Patent:GB379811 08.09.1932 Mercedes (P) Büromaschinen Werke : Improvements in and relating to calculating machines [16.78%]
Patent:GB380106 26.08.1932 Robert Anschuetz : Improvements in and relating to typewriter-calculating machines controlling card-perforating machines [16.44%]
Patent:GB380326 15.09.1932 Optische Anstalt C. P. Goerz (P) : Improvements in navigational calculating apparatus [17.99%]
Patent:GB380472 05.09.1932 Knut Andreas Knutsen : A printing device for use in connection with calculating machines, and particularly tabulating machines controlled by perforated cards [15.99%]
Patent:GB380612 22.09.1932 Adrema (P) Maschinenbau : Improvements in or relating to address-printing and calculating machines [15.72%]
Patent:GB380756 29.04.1932 Brunsviga (P) : Improvements in and relating to Calculating Machines [17.51%]
Patent:GB380777 10.03.1931 Burroughs (P) : Improvements in or relating to Driving Mechanism for Galculating or like Power Operated Machines [16.44%]
Patent:GB381395 06.10.1932 Faber Castell (P) : A slide rule for electrical engineers [9.54%]
Patent:GB381562 03.10.1932 Siemens (P) : Improvements in and relating to calculating machines [17.10%]
Patent:GB382242 20.10.1932 Thomas Walter Hall : Improvements relating to calculating devices [8.05%]
Patent:GB382257 20.10.1932 Giorgio Minas Giorgio Minas : A system for indicating the points in the game of bridge [16.51%]
Patent:GB382613 17.10.1932 Burroughs (P) Adding Machine Co : Improvements in or relating to paper carriages particularly for calculating machines [16.76%]
Patent:GB383250 24.08.1932 Brunsviga (P) : Improvements in and relating to Calculating Machines [18.18%]
Patent:GB383559 17.11.1932 Eugen Buschmann Wanderer (P) Werke : Improvements relating to platens, more particularly for typewriting and calculating machines [8.82%]
Patent:GB384216 01.12.1932 Nl Instr Cie Nedinsco Nv : Apparatus for compounding speed components particularly for gunnery [16.66%]
Patent:GB386147 12.01.1933 Brunsviga (P) Maschinenwerke Grimme und Natalis : Improvements in and relating to calculating machines [16.68%]
Patent:GB388053 17.08.1931 Burroughs (P) : Improvements in or relating to Keyboards for Calculating Machines, Cash Registers and the like Machines having Keyboards. [16.16%]
Patent:GB391869 02.10.1930 Burroughs (P) Adding Machine Co. : Calculating Apparatus [16.12%]
Patent:GB392181 01.05.1933 Muller, Robert Lucyan (P) Burroughs (P) Adding Machine Co. : Improvements in or relating to multiple register calculating or the like machines [16.29%]
Patent:GB392207 15.05.1933 Marie Emile Alfred Baule : Improvements in rheostats for use in electric calculating apparatus [17.78%]
Patent:GB392612 22.05.1933 Pierre, James Etienne Glogaud (P) : Improvements in combined printing, addressing and calculating machines [17.99%]
Patent:GB392622 25.05.1933 British Tabulating (P) Mach Co Ltd : Improvements in or relating to adding and/or listing machines [15.38%]
Patent:GB394203 22.06.1933 Mechanical Scorers Ltd : Instrument for registering bridge card game scores [15.79%]
Patent:GB395558 20.07.1933 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating and the like machines [17.19%]
Patent:GB395559 04.11.1932 Burroughs (P) Adding Machine Co. : Calculating Apparatus [18.69%]
Patent:GB395727 21.07.1933 NCR (P) : Improvements in or relating to calculating machines, bookkeeping machines and similar accounting machines [16.71%]
Patent:GB395981 15.02.1933 Astra (P) : Improvements in Adding and Subtracting Machines [17.63%]
Patent:GB396533 10.08.1933 Neil Lawson Lewis and Tylor Ltd : A slide rule connecting data relating to the discharge of water from nozzles [6.81%]
Patent:GB397518 25.08.1933 Burroughs (P) Adding Machine Co : Ribbon mechanism for calculating machines, typewriters and the like machines [16.75%]
Patent:GB397545 28.08.1933 Burroughs (P) Adding Machine Co : Ribbon mechanism for calculating machines, typewriters and the like machines [16.73%]
Patent:GB398851 22.09.1933 British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines [16.79%]
Patent:GB399019 28.09.1933 Burroughs (P) Adding Machine Co : Improvements in or relating to tally roll and like mechanisms for calculating machines, typewriters and the like machines [16.03%]
Patent:GB400967 03.11.1933 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating machines [16.55%]
Patent:GB400968 04.05.1931 Burroughs (P) Adding Machine Co. : Calculating Apparatus [16.87%]
Patent:GB401998 23.11.1933 Paillard and Cie Sa E : Improvements in the ribbon transport and automatic reverse mechanism in typewriters, calculating and similar machines [15.45%]
Patent:GB404950 23.01.1934 Burroughs (P) Adding Machine Co : Improvements in paper mechanisms for printing calculating machines or the like [16.73%]
Patent:GB405293 02.02.1934 Burroughs (P) Adding Machine Co : Improvements in or relating to paper mechanism for printing calculating machines [15.54%]
Patent:GB407738 29.03.1934 Ellis (P) Adding Typewriter Company : Improvements in or relating to calculating machines, accounting machines and similar machines [16.58%]
Patent:GB408795 19.04.1934 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating and/or check writing machines [17.01%]
Patent:GB409100 26.04.1934 Guido Gerhold : Electro-mechanical setting mechanism for use with calculating machines and cash registers [16.51%]
Patent:GB409371 30.04.1934 British Tabulating (P) Mach Co Ltd : Improvements in or relating to record-card controlled calculating machines [16.49%]
Patent:GB410129 09.05.1934 Valtat, Raymond Louis Andre (P) : Improvements in or retlating to Calculating and like Apparatus [17.18%]
Patent:GB412622 02.07.1934 NCR (P) : Improvements in or relating to card holding arrangements for accounting machines, calculating machines and similar machines [16.87%]
Patent:GB412626 02.07.1934 NCR (P) : Improvements in tally-roll mechanism for calculating machines, accounting machines and similar machines [16.19%]
Patent:GB412627 02.07.1934 NCR (P) : Improvements in tabulating mechanism for calculating machines, accounting machines and similar machines [16.02%]
Patent:GB412628 02.07.1934 Christian, Raymond Andrew (P) NCR (P) : Improvements in slip-holding mechanism for calculating machines, accounting machinesor the like [15.99%]
Patent:GB412747 05.07.1934 Boutet, René Edmond : Improvements in electric adding machines [17.49%]
Patent:GB413205 15.11.1933 Facit (P) : Improvements in Multiplying Machines [18.36%]
Patent:GB413308 09.07.1934 Algernon William Dargue, Frederick Lewin Dargue : Improvements in or relating to longitudinal slide+rules [7.14%]
Patent:GB414397 02.08.1934 Siemens (P) : Improvements relating to the automatic actuation of adding machines [17.32%]
Patent:GB414411 03.08.1934 British Tabulating (P) Mach Co Ltd : Improvements in or relating to adding and subtracting machines [16.09%]
Patent:GB414995 16.08.1934 Ernst Schumacher : Improvements in computing apparatus for transforming coordinates [16.59%]
Patent:GB416151 13.09.1934 Paulion Castells : Apparatus for the mechanical solution of systems of linear equations [18.17%]
Patent:GB416985 25.09.1934 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating and the like machines [16.27%]
Patent:GB417063 27.09.1934 Automatic, Electric Co Ltd (P) : Improvements in or relating to calculating machines [16.63%]
Patent:GB417632 09.10.1934 Adrema Maschinenbau : Improvements in and relating to address-printing machines [16.73%]
Patent:GB418993 05.11.1934 British Tabulating (P) Mach Co Ltd : Improvements in or relating to calculating machines [18.65%]
Patent:GB419201 07.11.1934 Goerz (P) Optische Anstalt Ag : Improvements in apparatus for mechanically solving threedimensional [17.06%]
Patent:GB420721 06.12.1934 Mercedes (P) Büromaschinen Werke : Improvements in and relating to typewriting-calculating machines [16.04%]
Patent:GB423169 24.01.1935 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating and the like machines [16.17%]
Patent:GB424132 15.02.1935 NCR (P) : Improvements in or relating to calculating machines, accounting machines and similar machines [17.07%]
Patent:GB424149 15.02.1935 NCR (P) : Improvements in or relating to release control mechanism for calculating machines, accounting machines, and similar machines [16.80%]
Patent:GB425690 20.03.1935 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating and the like machines [15.24%]
Patent:GB426605 05.04.1935 Wanderer (P) Werke : Paper feeding device for typewriters, calculating machines or similar office machines [10.93%]
Patent:GB427722 30.04.1935 Christian, Raymond A. (P) NCR (P) : Improvements in or relating to calculating machines, accounting machines and similar machines [15.89%]
Patent:GB428391 13.05.1935 British Tabulating (P) Mach Co Ltd : Improvements in or relating to statistical, calculating or like machines [16.71%]
Patent:GB429605 04.06.1935 British Tabulating (P) Mach Co Ltd : Improvements in or relating to statistical calculating and like apparatus [15.75%]
Patent:GB429717 05.06.1935 Charles Herbert Colvin : Improvements in navigating and calculating apparatus for aircraft [16.03%]
Patent:GB431314 12.12.1933 Nederlandsche Instrumenten Compagnie Nedinsco (P) : Improvements in Calculating Apparatus for Firing Directors for Shooting at Moving Aerial Targets [15.70%]
Patent:GB431353 05.07.1935 Burroughs (P) Adding Machine Co : Improvements in or relating to paper equipment for calculating and the like machines [16.24%]
Patent:GB431354 05.07.1935 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating or the like machines [27.83%]
Patent:GB431623 27.12.1934 Facit (P) : Improvements in Multiplying Machines [17.87%]
Patent:GB431627 01.02.1935 Facit (P) : Improvements in or relating to Multiplying Machines [16.91%]
Patent:GB432640 31.07.1935 British Tabulating (P) Mach Co Ltd : Improvements in or relating to record-card controlled calculating machines [16.21%]
Patent:GB433976 23.08.1935 Fritz Alois Hug und Victor Adolf Hug : Improvements in or relating to calculating apparatus for trigonometric calculations [17.28%]
Patent:GB434436 02.09.1935 British Tabulating (P) Mach Co Ltd : Improvements in or relating to sheet feeding mechanism for printing mechanism applicable to statistical, calculating and like machines [14.96%]
Patent:GB435462 23.09.1935 British Tabulating (P) Mach Co Ltd : Improvements in or relating to record-card controlled calculating machines [16.95%]
Patent:GB436462 11.10.1935 British Tabulating (P) Mach Co Ltd : Improvements in or relating to electro-magnetically controlled statistical, calculating and like machines [17.40%]
Patent:GB436540 14.10.1935 NCR (P) : Improvements in or relating to calculating machines, accounting machines and similar machines [19.50%]
Patent:GB437202 23.10.1935 D Instr De Prec Soc Ind : Improvements in or relating to printing calculating machines for use with punched cards [17.34%]
Patent:GB439228 02.12.1935 Edward Pallett, Alfred Cascelloid Ltd : Improvements in or relating to date indicators [29.04%]
Patent:GB439512 09.12.1935 IBM (P) : Improvements in or relating to keyboard controlled recording or [18.25%]
Patent:GB440715 03.01.1936 Nl Instr Cie Nedinsco Nv : Improvements in apparatus for finding the magnitudes of lead for [17.32%]
Patent:GB442142 03.02.1936 Burroughs (P) Adding Machine Co : Improvements in or relating to calculating and the like machines [17.11%]
Patent:GB442338 06.02.1936 Edmond Uher : Improvements in or relating to average-indicating instruments [16.73%]
Patent:GB442443 07.02.1936 NCR (P) : Improvements in or relating to calculating machines, accounting machines and similar machines [17.50%]

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