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06.01.1920 Mae Hosch Annie Measuregraph Company (P) : Calculating Apparatus
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06.01.1920 C. W. Gooch : Adding and Subtracting Machine
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06.01.1920 C. W. Gooch : Adding Machine
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06.01.1920 C. W. Gooch : Adding Machine
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27.01.1920 James L. Dalton (P) John Magnus Dalton (P) Adding Machine Comp. : Adding and recording machine
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27.01.1920 Friedman, Mitchell J. : Calendar
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27.01.1920 Pentecost, Arthur (P) Wales Adding Machine Comp. : Calculating machine
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27.01.1920 Sundstrand, Gustaf David (P) Rockford Milling Machine Compa : Listing Adding Machine
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27.01.1920 Chase, George Clinton (P) : Calculating Machine
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03.02.1920 Horatio Whiting Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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03.02.1920 Frome, John H. : Educational appliance
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03.02.1920 Hemmi, Jiro (P) : Slide Rule
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10.02.1920 H. W. Nieman : Calculator
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10.02.1920 Rowan-Legg, William Kinsley : Reference score reckoner
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10.02.1920 Frank B. Palmer Wales Adding Machine Comp. : Calculating machine
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10.02.1920 E. E. Phinney : Calculating Machine
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10.02.1920 Phinney, Edgar E. (P) Monroe (P) Calculating Machine Comp. : Carriage shifting means for calculating machines
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10.02.1920 Chase, George Clinton (P) Chase Adding Machine Corp. : Register
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17.02.1920 Charles R. Morse Morse Adding Machine Company : Computing machine
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24.02.1920 Ensign, Emory (P) Bleick Syndicate : Drive for calculating-machines
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02.03.1920 Ford, Hannibal (P) Ford Instr Co Inc : Calculating Instrument
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02.03.1920 Odhner, Valentin Jakob (P) : Coupling for detachably connecting coaxial shafts
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02.03.1920 John P. Cluley Cluley Multiplier Comp : Computing machine
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09.03.1920 Browne, Harry P.C. : Counting machine
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09.03.1920 W. A. Homan : Adding Machine
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09.03.1920 Niemann, Frederick (P) Adolph Felt und Tarrant (P) : Printing cut-out for adding-machines
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09.03.1920 Gubelmann, William S. (P) : Horizontal ruling mechanism for calculating and like machines
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16.03.1920 John E. Wright : Tabulating machine
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23.03.1920 Poole, Arthur (P) Wahl (P) Comp. : Calculating machine
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23.03.1920 Gubelmann, William S. (P) : Key interlocking mechanism for calculating and like machines
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30.03.1920 Eric Elias Svensson : Detent for calculating-machine
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30.03.1920 O. Malcher : Computing and Printing Scale
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30.03.1920 Phinney, Edgar (P) Monroe (P) Calculating Machine Co : Automatic carriage raising means for calculating machines
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06.04.1920 A. Pentecost and W. W. Fisher : Paper Carriage
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06.04.1920 A. Briechle Wales Adding Machine Company : Accounting Machine
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13.04.1920 Wherry John A : Collating device for typewriters and adding-machines
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13.04.1920 Fuller, Frederick (P) NCR (P) : Cash register
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13.04.1920 Harvey Corbin : Paper-support for combined adding and typewriting machines
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13.04.1920 Johantgen, Oliver David (P) : Listing Machine
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13.04.1920 William P. Galloway : Interest-computing device
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13.04.1920 Hopkins, Hubert (P) Moon-Hopkins (P) Billing Machine Co. : Calculating machine
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13.04.1920 Martin Swenson : Calculator
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27.04.1920 Bacon, George M. (P) : Multiplying machine
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27.04.1920 Wictor Oskar Julius Andersson : Calculating machine
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27.04.1920 F. L. Prescott : Calculating Device
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04.05.1920 Huntington, Robert (P) : Spherical triangle calculator
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04.05.1920 Skerl, Francesco; Graef, Forrest J. NCR (P) : Ticket issuing accounting machine
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11.05.1920 Charles Birth, W F Mckinley Wales Adding Machine Company : Calculating Machine
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11.05.1920 Hart, Frederick (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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18.05.1920 Chase, George Clinton (P) : Adding Machine
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18.05.1920 Bryce, James (P) International Time Recording Company of New York : Cost-keeping-machine
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18.05.1920 Benjamin P. Hayes Frank D. Laughlin Automatic Bookkeeping Register Comp. : Accounting machine
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25.05.1920 J. C. Enberg : Calculating Machine
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08.06.1920 W. J. Pasinski : Adding Machine
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08.06.1920 Pentecost, Arthur (P) Wales Adding Machine Comp. : Calculating machine
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15.06.1920 C. J. Davidson : Slide Rule
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15.06.1920 Arthur B. Christopher Measuregraph Comp. : Calculator
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06.07.1920 Joseph Louis Routin : Anti-aircraft-control system
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06.07.1920 Louis Routin, Joseph : Range finder
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06.07.1920 J. T. Hurley : Adding Machine
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06.07.1920 Pitman, Henry L. (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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20.07.1920 Cyrus Corliss : Time Computing Apparatus
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27.07.1920 Gustave O. Degener Underwood (P) Computing Machine Com. : Combined typewriting and computing machine
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03.08.1920 Haakon A. Martin NCR (P) : Registering-machine
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03.08.1920 Odhner, Valentin Jakob (P) : Calculating-machine
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03.08.1920 Odhner, Valentin Jakob (P) : Calculating machine
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10.08.1920 Gubelmann, William S. (P) : Dating mechanism for calculating and like machines
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10.08.1920 William J. Crumpton William R. Heath : Register
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10.08.1920 Middleton Charles S : Interest Calculator
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10.08.1920 Fitch, Charles Maximilian (P) Bird Adding Machine Company : Adding Machine
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10.08.1920 Walter Wright Underwood (P) Computing Machine Com. : Combined typewriting and computing machine
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17.08.1920 E. E. Phinney : Over Rotation Check for Calculating Machine Gears
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24.08.1920 Alton D. Harmon John S. Owen Annie W.S. Strong : Computing-machine
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24.08.1920 Arthur S. Trew Trew Tabulating Machine Comp. : Automatic pneumatic card tabulating machined
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31.08.1920 Roy E. Wing Burroughs (P) Adding Machine Comp. : Adding machine
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14.09.1920 Robert E. Kimball : Setback-register
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21.09.1920 Hutson, James L. : Perpetual calendar
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05.10.1920 Pitman, Harry L. Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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05.10.1920 Phinney, Edgar (P) Monroe (P) Calculating Machine Comp. : Keyboard clearing means for registers
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05.10.1920 Chase, George Clinton (P) : Adding Machine
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05.10.1920 Kammeyer, Charles (P) : Type Gage
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12.10.1920 Pentecost, Arthur (P) Wales Adding Machine Comp. : Calculating machine
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12.10.1920 Odhner, Valentin Jakob (P) : Transfer mechanism of calculating-machines
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19.10.1920 Adolph G. Kupetz Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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19.10.1920 J. C. Stevens : Water Level Recorder and Volume Meter
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26.10.1920 Dennis, A.S. (P) : Calculating Machine
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02.11.1920 John F. Robb : Accounting-machine-control means
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02.01.1920 Turck, Joseph Abraham Valentine (P) : Calculating Machine
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02.11.1920 Turck, Joseph Abraham Valentine (P) : Calculating Machine
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09.11.1920 Chase, George Clinton (P) and Mazzocco, Dante (P) Chase (P) Adding Machine Corporation : Zero-setting means for registers
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09.11.1920 Ferdinand J. Tillman Typewriter Calculating Attachment Comp. : Calculating attachment for typewriting machines
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09.11.1920 Andrew Ekman Accounting Machine Comp. : Adding machine
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09.11.1920 James Clarence Burne Monroe (P) Calculating Machine Comp. : Attachment to adding-machines
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16.11.1920 Horton, Allen (P) Burroughs (P) Adding Machine Comp. : Adding machine
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16.11.1920 Clifton B. Corell Underwood Elliott-Fisher (P) Comp. : Combined typewriting and computing machine
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23.11.1920 Gordon Monk, Sidney : Perpetual calendar
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27.11.1920 Alfred Crook Philadelphia Roll und Machine Comp. : Variable statistical chart
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07.12.1920 Odhner, Valentin Jakob (P) : Calculating machine
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07.12.1920 Fred M. Carroll Richard M. Blakely NCR (P) : Sorting and accounting machine
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14.12.1920 Duke Wittnebert : Adding and subtracting machine
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02.10.1920 Leinert, Wenzel W. : Calculating device