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Patent:11074704 17.01.2011 Felt, Dorr E. (P) : Calculating Machine [20.63%]
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Patent:11449639 17.01.2011 Turck, Joseph Abraham Valentine (P) : Calculating Machine [11.44%]
Patent:1148292 17.01.2011 Turck, Joseph Abraham Valentine (P) Felt und Tarrant (P) : Improvements in or connected with Calculating machines [47.85%]
Patent:1154603 17.01.2011 Turck, Joseph Abraham Valentine (P) Felt und Tarrant (P) : [51.49%]
Patent:11714964 17.01.2011 Turck, Joseph Abraham Valentine (P) : Calculating Machine [7.01%]
Patent:11751609 17.01.2011 Turck, Joseph Abraham Valentine (P) : Calculating Machine [11.73%]
Patent:1181043 17.01.2011 Felt und Tarrant (P) : Improvements in Calculating Machines [37.87%]
Patent:11840378 17.01.2011 C. Wittenmyer Felt und Tarrant (P) : Calculating Machine [12.21%]
Patent:11902597 17.01.2011 Turck, Joseph Abraham Valentine (P) : Calculating Machine [27.53%]
Patent:11902598 17.01.2011 Turck, Joseph Abraham Valentine (P) : Calculating Machine [13.09%]
Patent:12020975 17.01.2011 Turck, Joseph Abraham Valentine (P) : Calculating Machine [12.16%]
Patent:1207070 17.01.2011 Felt und Tarrant (P) : [54.28%]
Patent:12130364 17.01.2011 Niemann, Frederick (P) Adolph et al : Calculating Machine [12.73%]
Patent:12149817 17.01.2011 Niemann, Frederick (P) Adolph et al : Calculating Machine [11.65%]
Patent:12273491 17.01.2011 H. A. Leedy : Business Machine [11.61%]
Patent:12279054 17.01.2011 Niemann, Frederick (P) Adolph : Calculating Machine [10.90%]
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Patent:12753117 17.01.2011 Walker, E. C. (P) Felt und Tarrant (P) : Mechanism for Adjusting the Resistance to Key Depressions in Calculating Machines [19.55%]
Patent:12759671 17.01.2011 Turck, Joseph Abraham Valentine (P) Felt und Tarrant (P) : Key-Responsive Adding and Subtracting Calculating Machine [13.81%]
Patent:12956741 17.01.2011 Webb, Christopher Frederick (P) Bell Punch (P) : Key-Responsive Calc Mach Capable of Effecting Semi-Automatic Multiplication [13.01%]
Patent:13009634 17.01.2011 Allward Comptometer (P) : Ten-Key Calculating Machines [11.40%]
Patent:1341435 17.01.2011 Felt und Tarrant (P) : [30.19%]
Patent:1371496 17.01.2011 Felt, Dorr E. (P) : Adding Machine [12.16%]
Patent:1441232 17.01.2011 Felt, Dorr E. (P) : Type Writing Machine [12.28%]
Patent:1516535 17.01.2011 Webb, Christopher Frederick (P) : comptometer-like adding machine [50.80%]
Patent:1516557 17.01.2011 Webb, Christopher Frederick (P) : comptometer-like adding machine [20.78%]
Patent:1522721 17.01.2011 Webb, Christopher Frederick (P) : comptometer-like adding machine [53.62%]
Patent:1551707 17.01.2011 Felt und Tarrant (P) : Improvements in or relating to numeral wheels or the like [31.37%]
Patent:1551994 17.01.2011 Felt und Tarrant (P) : [30.03%]
Patent:1553198 17.01.2011 Felt und Tarrant (P) : [48.91%]
Patent:1556239 17.01.2011 Felt und Tarrant (P) : [53.48%]
Patent:1640347 17.01.2011 Felt und Tarrant (P) : [30.84%]
Patent:1640445 17.01.2011 Felt und Tarrant (P) : [11.48%]
Patent:1650728 17.01.2011 Felt und Tarrant (P) : Improvements in or relating to finger-operable actuator buttons for calculating machines, typewriters and other office machines [10.59%]
Patent:1652670 17.01.2011 Webb, Christopher Frederick (P) Bell Punch (P) Co Ltd : comptometer-like adding machine [53.85%]
Patent:1661121 17.01.2011 Felt, Dorr E. (P) : Calculating Machine [12.15%]
Patent:1671109 17.01.2011 Felt, Dorr E. (P) : Calculating Machine [11.96%]
Patent:1733379 17.01.2011 Felt, Dorr E. (P) : Casing for Key Operated Machines [24.52%]
Patent:1918176 17.01.2011 C. & C. A. Lory : Water Meter [6.37%]
Patent:1960528 17.01.2011 Felt, Dorr E. (P) : Calculating Machine [28.98%]
Patent:1982416 17.01.2011 Felt, Dorr E. (P) : Key for Keyboard Calculating Machine [21.01%]
Patent:1982417 17.01.2011 Felt, Dorr E. (P) : Key for Keyboard Machine [19.92%]
Patent:1992950 17.01.2011 Felt, Dorr E. (P) Felt und Tarrant (P) : Calculating Machine [21.31%]
Patent:1996009 17.01.2011 Felt, Dorr E. (P) : Calculating Machine [11.80%]

Patent:CA555598 08.04.1958 Lawrence W. Brugman, Raymond F. Koch Comptometer (P) Corp. : Calculating machine [51.87%]
Patent:CA568285 30.12.1958 Emil C. Walker, jr. Comptometer (P) Corporation : Mechanism for adjusting the resistance to key depressions in calculating machines [50.80%]
Patent:CA593631 01.03.1960 Raymond J. Koch Comptometer (P) Corp. : Calculating machine [52.99%]
Patent:CA630098 31.10.1961 Richard T. Prince Comptometer (P) Corp. : Calculating-recording apparatus [52.42%]
Patent:CA716944 31.08.1965 Eugene v. Heitlinger Victor Comptometer Corp. : Calculating machines [52.42%]

Patent:DE235371 26.01.1910 Felt und Tarrant (P) : Addiermaschine [6.21%]
Patent:DE237660 16.03.1909 Felt und Tarrant (P) : Nullstellvorrichtung für Addiermaschinen [5.83%]
Patent:DE284268 28.11.1912 Felt, Dorr E. (P) Felt und Tarrant (P) : Rechenmaschine [6.65%]
Patent:DE310417 12.07.1913 Felt, Dorr E. (P) Felt und Tarrant (P) : Rechenmaschine [6.29%]
Patent:DE383972 05.10.1919 Felt und Tarrant (P) : Nullstellvorrichtung für Rechenmaschinen [10.03%]
Patent:DE395707 23.05.1924 Felt und Tarrant (P) : Nullstellvorrichtung für Rechennmaschinen [10.03%]

Patent:FR1293204 02.04.1962 von Heitlinger, Eugene Comptometer (P) Corp. : Machines à calculer [52.99%]

Patent:GB190925766 15.09.1910 Felt, Dorr E. (P) : Improvements relating to Calculating Machines [32.86%]
Patent:GB191226772 26.11.1913 Felt, Dorr E. (P) : Improvements in and relating to Calculating Machines [30.09%]
Patent:GB566376 16.09.1942 Felt und Tarrant (P) : Calculating-machine [29.70%]
Patent:GB600485 22.06.1945 Stevens, A. H. Felt und Tarrant (P) : Improvements in or Relating to Calculating Machines [33.40%]
Patent:GB601375 23.07.1943 Felt und Tarrant (P) : Improvements in or Relating to Calculating Machines [28.71%]
Patent:GB601427 05.05.1948 Felt und Tarrant (P) : Improvements in or relating to Calculating Machines [30.68%]
Patent:GB712749 28.07.1954 Turck, Joseph Abraham Valentine (P) Felt und Tarrant (P) : Improvements in or relating to calculating machines [11.06%]
Patent:GB712750 28.07.1954 Turck, Joseph Abraham Valentine (P) Felt und Tarrant (P) : Improvements in or relating to calculating machines [28.80%]
Patent:GB752591 11.07.1956 Felt und Tarrant (P) : Improvements in or relating to calculating machines [30.35%]
Patent:GB771816 03.04.1957 Felt und Tarrant (P) : Improvements in or relating to calculating machines [30.76%]
Patent:GB860605 08.02.1961 Comptometer (P) Corp : A calculating-recording apparatus [12.21%]
Patent:GB902247 01.08.1962 Comptometer Corp. : Ten-key calculating machines [53.56%]

Patent:US1333277 09.03.1920 Niemann, Frederick (P) Adolph Felt und Tarrant (P) : Printing cut-out for adding-machines [6.72%]
Patent:US1927856 26.09.1933 Ferris Roy (P), Turck, Joseph Abraham Valentine (P) Felt und Tarrant (P) : Calculating Machine [10.83%]
Patent:US2060702 10.11.1936 Turck, Joseph Abraham Valentine (P) Felt und Tarrant (P) : Calculating Machine [7.08%]
Patent:US2402569 25.06.1946 Niemann, Frederick (P) Adolph Felt und Tarrant (P) : Key responsive calculating machine [6.68%]
Patent:US2835440 20.05.1958 Raymond J. Koch Comptometer Corp. : Flash reading indicating means for registers [50.80%]
Patent:US2980322 18.04.1961 Emil C. Walker Comptometer Corp. : Decimal point indicator mechanism for registers [50.80%]
Patent:US3217984 16.11.1965 Heitlinger Victor (P) Comptometer (P) : Sectionalized Solenoid-Actuated Calc Mach [44.33%]
Patent:US3402884 24.09.1968 Schultz, Ralph (P) Victor (P) Comptometer Corp : Operating Means For Function Control Keys In Calculating Machines And The Like [9.81%]
Patent:US441233 25.11.1890 Felt, Dorr E. (P) : Adding and Recording Machine [52.99%]
Patent:USD113817 14.03.1939 Niemann, Frederick (P) Adolph et al Comptometer (P) : Calculating Machine [20.93%]

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