Patent
Suchergebnisse für: Rechenschieber
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Patent:CH105522
01.07.1924 Brandstetter, Georg (P) Geobra (P) : Rechenschieber
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Patent:CH146298
01.07.1931 Raymond Cartier : Règle à calculs de poche
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Patent:CH149468
15.09.1931 Huber, Jakob (P) : Rechenschieber
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Patent:CH149469
15.09.1931 Baumann und Cie : Rechenschieber
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Patent:CH156787
31.08.1932 Mauser (P) Werke Ag : Als Rechenschieber verwendbare Schieblehre
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Patent:CH162499
30.06.1933 Seehase, Hans (P) : Rechenschieber
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Patent:CH176397
15.04.1935 Hans, Baumgartner (P) : Rechenschieber
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Patent:CH211332
15.09.1940 Askania (P) Werke Ag : Logarithmischer Rechenschieber mit drei gegeneinander verschiebbaren Skalentraegern
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Patent:CH213636
28.02.1941 Wueest, Emil (P) : Rechenschieber zur direkten Ermittlung von Daten von Tragkonstruktionen
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Patent:CH218128
30.11.1941 Hopferwieser, Stephan (P) Hopferwieser, Stephan (P) : Rechenschieber zur Ermittlung des zwei Werten des Leistungsfaktors entsprechenden Blindleistungsunterschiedes
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Patent:CH221635
15.06.1942 Fahrni, Karl (P) : Als Rechenschieber ausgebildetes Schreibgeraet
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Patent:CH22946
15.05.1902 Masera, Silvio (P) : Rechenschieber
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Patent:CH232158
15.05.1944 Hopferwieser, Stephan (P) : Rechenschieber zur Loesung bestimmter technischer Rechenaufgaben
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Patent:CH232662
15.06.1944 Bopp, Franz (P) : Rechenschieber zur Ermittlung der Abweichung einer Laenge von einer Bezugslaenge aus Interferenzmesswerten
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Patent:CH244088
31.08.1946 Roozendaal, Cornelis (P) : Rechenschieber fuer das Berechnen von Balken und Boeden aus Eisenbeton
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Patent:CH247032
15.02.1947 Luescher, Theo (P) : Rechenschieber
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Patent:CH253994
15.04.1948 Bondietti, Franz (P) : Rechenschieber zur Berechnung von Bearbeitungszeiten fuer die Kalkulation
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Patent:CH25781
30.06.1903 Tiraspolsky, Grigory (P) und Aumund, Johannes (P) : Logarithmischer Rechenschieber
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Patent:CH260899
15.04.1949 Kunz, Friedrich (P) : Rechenschieber
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Patent:CH26145
31.07.1903 Wilh, Frank (P) : Rechenschieber
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Patent:CH262319
30.06.1949 Goldstaub, Heinz Herbert (P) : Rechenschieber
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Patent:CH269217
30.06.1950 Egli, Rudolf (P) und Hafner Ernst (P) Egli, Rudolf (P) und Hafner Ernst (P) : Rechenschieber
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Patent:CH270064
15.08.1950 Bollmann, Carl (P) : Mit einem Rechenschieber versehenes Schreibgeraet
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Patent:CH281155
29.02.1952 Neuenschwander, Walter (P) : Mit einem Schreibgeraet kombinierter Rechenschieber
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Patent:CH301491
15.09.1954 Meidow, Fritz (P) : Rechenschieber zum Ermitteln von Gewicht und Preis profilierter Werkstuecke
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Patent:CH315638
31.08.1956 Bernhard, Hans (P) : Rechenschieber fuer die Kalkulation von Arbeitszeiten
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Patent:CH320811
15.04.1957 Rothenfluh, Anton (P) : Rechenschieber
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Patent:CH335146
31.12.1958 George, W Jernstedt (P) Langbein Pfanhauser Werke Ag : Rechenschieber fuer die Galvanotechnik
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Patent:CH366989
31.01.1963 Aich, Werner Fritz (P) : Rechenschieber fuer Waehrungsumrechnungen
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Patent:CH406685
31.01.1966 Badalamenti, Gaetano (P) : Rechenschieber zur Ermittlung von Primfaktoren von ganzen Zahlen
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Patent:CH407600
15.02.1966 Anton, Rothenfluh (P) : Rechenschieber
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Patent:CH415128
15.06.1966 Gamner, Bengt Hugo (P) : Rechenschieber zur Bestimmung einer wirtschaftlichen Schnittgeschwindigkeit
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Patent:CH477052
15.08.1969 Holliger, Hermann (P) : Instruktions-Rechenschieber
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Patent:CH514886
31.10.1971 Itab Dogigli Kg : Rechenschieber
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Patent:CH524198
15.06.1972 Andree, Hans-Martin (P) Intersport Egmbh Deutsche : Kreisfoermiger Rechenschieber
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Patent:CH81638
01.07.1919 Sprenger, Anton (P) : Mit einer Taschenuhr verbundener Rechenschieber
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Patent:CH82998
01.11.1919 Landtblom, Frans (P) : Logarithmischer Rechenschieber zur Berechnung von Maschinenteilen
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Patent:CH89269
16.05.1921 Schacht und Westerich (P) : Rechenschieber
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Patent:CH97093
01.12.1922 Schaad, Walter (P) : Rechenschieber
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Patent:CH98588
02.04.1923 Gugerli, Emil (P) : Rechenschieber mit drehbarem Lineal und Einstecklineal
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Patent:CN1184966
17.06.1998 Yang Zuwen : Slide Rule for calculating mixing ratio of concrete
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Patent:CN1191999
02.09.1998 Yang Zuwen : Slide Rule for the design of reinforced concrete beam and plate
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Patent:CN2030735u
11.01.1989 Quancong Zhang : Slide Rule For Food Nutritive Value
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Patent:CN2032343u
08.02.1989 Yukun Liu : Slide Rule For Children Doing Addition And Subtraction
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Patent:CN2034306u
15.03.1989 Weiti Yu : Eugenics Measuring Slide Rule Using Biogenetic Rhythm
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Patent:CN2034719u
22.03.1989 Jiankun Wu : Slide Rule With Human Body Biorhythmic Chronometer
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Patent:CN2038256u
24.05.1989 Hongfei Miao Station Of Sanitation And Epid : Slide Rule For Biotic Rhythm Of Human Body
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Patent:CN2042612u
09.08.1989 Su Mingkun : Student Slide Rule For Division And Multiplication Operation
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Patent:CN2042980u
16.08.1989 Qihua Huang : Three-Rhythm Slide Rule For Human Body
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Patent:CN2046241u
18.10.1989 Daiying Meng : X-Ray Photography Siemens Numeral Theory Exposure Factor Disk Slide Rule
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Patent:CN2047043u
01.11.1989 Qiuqun Chen : Calendar With Slide Rule For Calculating Physical, Morale, Intelligence Prosperity And Decline Law
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Patent:CN2048213u
22.11.1989 Chengjia Wang : Azimuth Slide Rule Of Elliptical Closed And Open-Hole
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Patent:CN2048995u
06.12.1989 Kegang Zhou : Slide Rule For Disease Examination
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Patent:CN2051754u
24.01.1990 Manshang Teng : Slide Rule For Spherical Surface Precision Working
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Patent:CN2053770u
28.02.1990 Changda Peng : Slide Rule For Calculating Common Metal Materials Weight
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Patent:CN2054178u
07.03.1990 Qian Liu : Quickly Looking Up Slide Rule For Contraception Safety Perild
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Patent:CN2054551u
14.03.1990 Zhenmin Xu : Child Immunity Programme Slide Rule
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Patent:CN2064912u
31.10.1990 Zizheng Zou : Quota Oil Consumption Slide Rule For Car
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Patent:CN2072702u
06.03.1991 Zhenghong Li : Multi-Functional Clinical Slide Rule
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Patent:CN2077565u
22.05.1991 Zepu Duan : Slide Rule For Actual Cement Strength
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Patent:CN2079326u
19.06.1991 Weidong Gao : Practical Press Enthalpy Figure Slide Rule
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Patent:CN2083306u
21.08.1991 Jinduo Wang : Slide Rule For Adjustment Of Hot-Water Heating Operation
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Patent:CN2091771u
01.01.1992 Longbing Yue : Multi-Purpose Combined Slide Rule
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Patent:CN2092121u
01.01.1992 Xinsheng Jia : Gpt Slide Rule
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Patent:CN2104632u
20.05.1992 Shibai Yu : Measuring Slide Rule Based On Human BodyS X-Ray Photograph
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Patent:CN2108961u
01.07.1992 Weidong Gao : Slide Rule For Enthalph-Entropy Diagram
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Patent:CN2113516u
19.08.1992 Wurelibiek : Trigonometric Function Slide Rule
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Patent:CN2120358u
28.10.1992 Fude Li : Multi-Function Slide Rule For Paediatrics
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Patent:CN2121717u
11.11.1992 Jiao Yu Qingdao Municipal Hospital : Multifunction Healthy Slide Rule For Pregnancy
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Patent:CN2125161u
16.12.1992 Zhiqiang Bai : Sugar Density Oversaturation Slide Rule
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Patent:CN2132214u
05.05.1993 Jianmei Hang : Slide Rule For Recipes
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Patent:CN2133879u
19.05.1993 Zhangda Peng : General Building Construction Slide Rule
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Patent:CN2141097u
25.08.1993 Jianping Guo : Slide Rule For Guiding Growth, Nutrition And Health Of Children
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Patent:CN2260339U
20.08.1997 Peng Changda : Usual Slide Rule for construction building quality
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Patent:CN2325822U
23.06.1999 Li Chengzhong, Song Xinrui : Portable electric axle Slide Rule
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Patent:CN2384591U
28.06.2000 Luo Xinshan : Medical fluid infusion Slide Rule
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Patent:CN2399778U
04.10.2000 Zhang Jinshan : Child digital Slide Rule
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Patent:CN2413318U
03.01.2001 Liu Zhihua, Qiang Jianjuan : Dry Slide Rule
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Patent:CN2449190U
19.09.2001 Zhang Weike : Checking sample plate with Slide Rule
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Patent:CN2545988U
23.04.2003 Yu Shibo : Human X-ray photographical Slide Rule
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Patent:CN85108776
03.06.1987 : Slide Rule Of Prime Number-Complex Prime Number
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Patent:CN85200090u
29.10.1986 : Special Slide Rule To Map Positive Axis Projection Drawing
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Patent:CN85203274u
22.10.1986 : Universal Slide Rule For Electroplating
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Patent:CN86107939
01.06.1988 : Slide Rule For Cardiovascular Data Calculations
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Patent:CN86206968u
28.10.1987 : Slide Rule For Fluid Infusion As Burn
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Patent:CN86207068u
07.11.1987 : Hardness-Test Slide Rule
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Patent:CN86210645u
31.10.1987 : Circular Slide Rule For Converting Electric Level
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Patent:CN87100045
03.08.1988 : Childrens Addition-Subtraction Slide Rule
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Patent:CN87203260u
13.04.1988 : Slide Rule Of Experimental Compress Coefficient For Crchitectural Engineering
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Patent:CN87204467u
14.09.1988 : Literature Slide Rule
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Patent:CN87212707u
13.07.1988 : Slide Rule For Enlarging X-Ray Photo-Prints
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Patent:CN87213911u
30.11.1988 : Quick Slide Rule For Human Biological Rhythm
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Patent:CN87214735u
26.10.1988 : Constructive Component Slide Rule For The Construction In Villages And Towns
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Patent:CN87215290u
17.08.1988 : Slide Rule For Calculating Biorhythm
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Patent:CN88200695u
30.11.1988 : Slide Rule For Human Rhythm Period
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Patent:CN88203021u
21.12.1988 : Dosage Slide Rule For Children
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Patent:CN88204057u
21.09.1988 : Slide Rule For Chain Wheel Of Bushroller Chain
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Patent:CN88204061u
19.10.1988 : Slide Rule For Common Normal Line Of Involute Cylindric Gears
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Patent:CN88204254u
21.12.1988 : Slide Rule For Chlorine-Alkali Production
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Patent:DE102599
28.06.1898 Mack, J. G. D. (P) : Rechenschieber
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Patent:DE1067622
25.10.1959 Bachmann, Harald (P) Faber Castell (P) : Rechengeraet, insbesondere fuer das Rechnen mit komplexen Zahlen
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18.09.1956 Schönner, Willy A.W. Faber-Castell (P) : Rechenschieber für Unterrichts- und Reklamezwecke
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30.04.1958 Electroacustic (P) GmbH : RECHENSCHIEBER ZUR BESTIMMUNG DER REICHWEITE AKUSTISCHER ORTUNGSSIGNALE.
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01.04.1971 Dogigli, Hans (P) ITAB Dogigli : Rechenschieber
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Patent:DE19701250
23.07.1998 Schulz Rolf : Electro cardiograph date Slide Rule
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20.07.2000 Menzel Reiner : Set square with Slide Rule for navigation at sea
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Patent:DE19922436
16.11.2000 Feiffer Peter, Kluesendorf-Feiffer Andrea : Optimization of the harvesting process using a combine harvester by use of a Slide Rule type device to enable optimum machine settings and
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Patent:DE335443
27.02.1920 Theis, Albert (P) und Homminger, Karl (P) : Rechenschieber mit gleichmässig geteilten Skalen für Zeitberechnung
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Patent:DE339707
06.01.1920 Trentmann, Hans (P) : Rechenschieber nach Patent 317732 mit mehreren Läufern auf einer Grundplatte
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Patent:DE365393
14.12.1922 Lissauer, Walter (P) : Rechenschieber
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Patent:DE365637
19.12.1922 A W Faber (P) : Rechenstab
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Patent:DE365638
19.12.1922 Seehase, Hans (P) : Rechenschieber aus Metall
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17.08.1921 Picchi, Alberto (P) : Rechenstab mit Doppelläufer
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13.03.1923 Lissauer, Walter (P) : Röhrenförmiger Rechenschieber
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07.04.1923 Bandermann, Werner (P) : Rechenschieber mit von Hand zu drehendem Stellenzähler
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04.04.1922 Siemens (P) Schuckertwerke Gmbh : Rechenschieber, Massstäbe und ähnliche Geräte
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28.01.1922 Krems, Otto (P) : Rechenschieber
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21.08.1923 A W Faber (P) : Rechenrad, Rechenschieber
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25.08.1923 Scheh, Oskar (P) : Rechenstab
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10.09.1923 Thoma, Engelbert (P) und Steichele, Anton (P) : Rechenschieber
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07.11.1923 Brandstetter, Georg (P) Geobra (P) : Rechenschieber
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Patent:DE385681
20.07.1921 Schwanda, Josef (P) : Rechenschieber
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08.11.1922 Freidenberg, David (P) : Rechenstab
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29.02.1924 Seiliger, Myron (P) : Rechenschieber
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Patent:DE394337
30.04.1924 Seehase, Hans (P) : Rechenschieber
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Patent:DE397777
05.07.1924 J B Soellner Nachf Reisszeugfabrik : Rechenschieber
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Patent:DE400850
17.10.1923 Schuster, Karl (P) und Schuster, Emil (P) : Rechenschieber
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21.10.1924 Uhlich, Rudolf (P) : Rechenschieber
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25.10.1924 Brandenberg, Ludwig (P) : Rechenschieber
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10.01.1924 Czerney, Wilhelm (P) : Rechenschieber
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Patent:DE410271
03.03.1925 Kretschmer, Walter (P) : Zweidimensionaler Rechenschieber
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Patent:DE410565
03.03.1925 Albert Nestler (P) Akt Ges : Rechenschieber
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Patent:DE422962
10.07.1926 Wierich, Walter (P) : Rechenschieber für spanabhebende Werkzeugmaschinen
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Patent:DE423733
11.01.1925 Schauer, Joachim (P) : Als Feder- oder Bleistifthalter ausgebildeter Rechenschieber
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Patent:DE428216
28.04.1926 Maldotti, Bruno (P) : Rechenschieber
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10.01.1927 Reichert, Wilhelm (P) : Rechenschieber
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Patent:DE440549
05.02.1927 Reichert, Wilhelm (P) : Rechenschieber
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06.10.1927 A W Faber (P) : Rechenstab
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06.10.1927 Welsch, Georg (P) : Logarithmischer Taschenrechenschieber mit zusammenlegbarer Zunge
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Patent:DE585216
29.09.1933 : Bandmassrechenschieber
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Patent:DE589000
23.08.1931 Deutsch, Richard (P) : Füllbleistift mit Rechenschieber
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Patent:DE7027493U
22.10.1970 ITAB Dogigli (P) KG : Rechenschieber
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04.02.1893 Neumann, H. (P) : Rechenschieber
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28.03.1939 Seehase, Hans (P) : Rechenschieber
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Patent:FR2586837
06.03.1987 Darne Andre : Novel type of Slide Rule of the type comprising a case consisting of two adjoining walls leaving a gap in which at least one slide moves
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Patent:FR2592711
10.07.1987 Figard Pierre Freix Sarl Ets : Slide Rule with double reading
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Patent:FR2616249
09.12.1988 Bartier Jean-Claude Hoffmann La Roche : Slide Rule
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22.09.1989 Maugein Jean Avenir Projets Innovation Cons : Slide Rule for computation of prodn. cost of item - uses four scales, of which two move, and pivoted nomogram cursor at end on one of movin
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Patent:FR2754078
03.04.1998 Bach Julien : Slide Rule for calculating exposure for black and white photographic paper
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04.06.1999 Le Noane Pierrick, Ropers Jean Yves, Ricard Jean Luc : Measurement and decimal conversion Slide Rule for teaching purposes
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01.10.1999 Durif Jean Luc : Slide Rule for computation of tide levels
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Patent:FR2802680
22.06.2001 Genevois Jean Michel Total Fina Sa : Slide Rule for calculating directional drilling of borehole has interchangeable stackable disks, further coaxially mounted partial disk(s) a
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Patent:FR2823582
18.10.2002 Tollitte Francois Goerges : Device for reciprocal conversion between two currencies using a given factor, by use of a small card with a Slide Rule type scale and cursor
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Patent:GB1024425
30.03.1966 Stanley, Horace Frederick Sarl (P) : Improvements in calculating devices
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Patent:GB1046023
19.10.1966 Chorton, John (P) : Slide rule
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18.06.1917 Berson, Theodore (P) Holophane Ltd : Improvements in and connected with Slide Rules and like Calculating Instruments
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05.07.1917 Hemmi, Jiro (P) : Improvements in the Slide Rules
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17.07.1917 Stokes, George Duncan Campbell (P) : A Field Gunnery Calculating Slide Rule for use with the 18 Pounder Q.F. Gun
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Patent:GB108197
27.07.1917 Martin, Arthur John (P) : Improvements in Slide Rules for use in Wireless Telegraphy
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Patent:GB1082952
13.09.1967 Robinson, Anthony (P) Dowty Group Services : Slide rule
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Patent:GB1113256
08.05.1968 Retel, Rene (P) Rhone Poulenc Sa : Slide rule
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25.09.1968 Paul Milton Pepper : Improvements in or relating to calculating devices of the slide rule type
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02.04.1969 Vorpahl, Carl Heinz (P) Bishman Mfg Company : Slide rule
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Patent:GB115207
13.12.1917 Buchanan, W. S. : Slide Rules for Determining the Output of Paper Making Machines
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18.07.1918 Chew, Albert Charles (P) : Slide Rule
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Patent:GB122900
06.02.1919 Cox, Charles Henry Farley (P) : Improvements in or relating to Slide Rule for Finding the Value of Goods sold by Weight or Measure
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Patent:GB1276784
07.06.1972 Dogigli, Johannes (P) ITAB Dogigli (P) KG : Slide Rule
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15.08.1973 Int Communications Lab Inc : Rectilinear Slide Rule For Calculating Pi X And Pi X2
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Patent:GB133577
30.01.1919 Windle, E : Plane Trigonometry Calculators, Slide Rules
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Patent:GB134833
05.11.1918 Fabriques des Montres Zenith : Slide Rule
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Patent:GB135671
21.12.1918 Martin, W. H. : Slide Rule
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Patent:GB1386730
12.03.1975 St, Josephs Hospital Medical Ce (P) : Slide Rule Guide To Intravenous Therapy
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Patent:GB1402412
06.08.1975 Magyar Asvanyolaj Es Foeldgaz : Slide Rule For Use Inter Alia In The Interpretation Of Gas- Chromatograms
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04.02.1976 Faber Castell (P) : Slide Rule With Computer
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01.06.1920 Oswald, George Winzar (P) : Improvements in and relating to calculating devices of the slide rule type
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29.09.1976 Whitfield, L (P) : Slide Rule
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24.11.1976 Grand, C : Slide Rule For Determining The Losses Of Head Along Pipes
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08.12.1920 Charles Herbert Booth Halstead Best : Improved calculating device or slide rule
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04.08.1921 August Straub, Andreas Hochstrasser : Improvements in or relating to sliding rules
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Patent:GB189409900
18.05.1895 Watson, Thomas Henry (P) : An Improved Double Slide Rule for Calculating Displacement, Register Tonnage, Indicated Horse Power, and Speed of Ships
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Patent:GB189503937
04.01.1896 Eagles, James (P) : An Improved Cylindrical Slide Rule
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Patent:GB189614623
15.05.1897 Sheridan, Matthew Joseph (P) : A New and Improved Slide Rule for Reducing Spirits
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Patent:GB190325109
27.10.1904 Baines, Hewley Mortimer (P) : Improvements in Slide Rules and like Calculating Apparatus
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Patent:GB190401787
31.03.1904 Macmaster, Peter (P) : An Improved Elapsed Time Calculator
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Patent:GB190502610
01.02.1906 Davis, Henry (P) und Smith, John William (P) : Wages and Premium Calculator
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Patent:GB190507546
01.03.1906 Wimpenny, William Ernest (P) und Salomon, Alfred (P) : Improvements in and relating to Slide or like Rules for Calculating Interest on Investments
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Patent:GB190906064
29.07.1909 Edge Douglas Ross und Hunter John Chalmers : Improvements in Weight Calculating Slide Rules
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Patent:GB191225466
06.11.1913 Weale, James Anthony (P), Jones, Edward (P) : A Slide Rule for Calculations in Measuring and Pricing Timber
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Patent:GB191322165
12.02.1914 Agnew Richard Fletcher : Slide Rule
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Patent:GB191424239
17.12.1915 Gray, John (P) : An Improved Slide Rule
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Patent:GB191512966
17.08.1916 Brown, William Fearon (P) : An Improved Slide Rule
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Patent:GB196589
16.08.1923 A W Faber Castell (P) Bleistift Fa : Improvements in Slide Rules
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Patent:GB2035640
18.06.1980 Craig, G (P) : Instructional device of the slide rule type
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Patent:GB207694
06.12.1923 George Willis Grey : Improvements in or relating to calculating slide rules
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Patent:GB2110848
22.06.1983 Riehle, Harald (P) : Slide Rule
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Patent:GB2155672
25.09.1985 Zhang Tianze Tsinlien Trading Co Ltd : Slide rule
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21.10.1992 Mckenna, Josephine (P) und McKenna, James (P) : Musical Transposition Slide Rule
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09.06.1993 Forster, Brenda Coralie (P) : Harmony slide rule
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12.08.1998 Hadjigeorgiou, Agamemnon Charal (P) : Slide rule
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07.05.1925 Gebr. Wichmann (P) M B H : Improvements in slide rules and like calculating apparatus
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Patent:GB259112
07.10.1926 Schauer, Joachim (P) : Improvements in or relating to logarithmic calculating apparatus combined with writing implements
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Patent:GB284445
02.02.1928 Black, John (P) : Slide rule for paper makers
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Patent:GB290746
21.05.1928 Ruben Brusch : Calculating cylindrical slide rules with slider
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Patent:GB318150
26.06.1930 Fernand, Joseph Bourgeois (P) : Toy slide rule
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Patent:GB322943
19.12.1929 Lawrence, John De Whalley (P) : A slide rule or calculator for use in sugar boiling
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Patent:GB335379
25.09.1930 Neil Lawson Lewis and Tylor Ltd : A slide rule for calculating data connected with belting
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Patent:GB381395
06.10.1932 Faber Castell (P) : A slide rule for electrical engineers
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Patent:GB391617
04.05.1933 Jordan, Socrates Askitopoulos (P) : Combined slide rule and surveying instrument
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Patent:GB395992
27.07.1933 Faber Castell (P) : Improvements in and relating to a slide rule
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Patent:GB396533
10.08.1933 Neil Lawson Lewis and Tylor Ltd : A slide rule connecting data relating to the discharge of water from nozzles
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Patent:GB411090
29.05.1934 Boardman, Hubert (P) A.G. Thornton (P) : Improvements in Slide Rule Calculators
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Patent:GB424863
01.03.1935 A W Faber Castell (P) : Improvements in or relating to cursors for Slide Rules
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Patent:GB447001
11.05.1936 William Dubilier : Improvements in or relating to slide rules and like calculating apparatus
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Patent:GB468257
01.07.1937 Boardman, Hubert (P) & Clayton, Albert Edmund (P) & Naylor, Felix Samuel (P) Thornton (P) Ltd : Improvements in Slide Rule calculators, other scale devices, and direction drawing instruments
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02.07.1937 A W Faber Castell (P) : Improvements in and relating to Slide Rules
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Patent:GB469838
04.08.1937 John Dunbar Blyth : A height computing slide rule
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Patent:GB489501
28.07.1938 Charles Andrew Fountaine : Improvements in or relating to calculating slide rules
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Patent:GB489603
28.07.1938 Charles Andrew Fountaine : Improvements in or relating to calculating slide rules
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