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04.01.1921 F. O. Stillman and H. M. Schleicher : Slide Rule
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04.01.1921 Dennis, A.S. (P) Marchant (P) Calculating Machine Comp. : Transfer mechanism for calculating-machines
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25.01.1921 Hopkins, Hubert (P) Moon-Hopkins (P) Billing Machine Co. : Calculating-machine
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01.02.1921 W. L. Jones : Perpetual Calendar
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08.02.1921 Hopkins, William Wallace (P) : Calculating-machine
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15.02.1921 A. Briechle : Calculating Machine
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22.02.1921 John Waldheim Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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22.02.1921 Goldberg, Hyman Eli (P) Goldberg Calculating Machine (P) Co : Calculating-machine
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22.02.1921 Thomas Edward G Toledo Scale Co : Price-calculating weighing-scale
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22.02.1921 Frederick L. Fuller NCR (P) : Cash-register
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01.03.1921 Benjamin M. des Jardins Underwood (P) Computing Machine Comp. : Computing machine
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01.03.1921 Wilde, Noel : Perpetual calendar
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01.03.1921 Blaustein, Joseph Controller Comp., Inc. : Calculating Machine
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01.03.1921 Stickney, Burnham (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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01.03.1921 Stickney, Burnham (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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01.03.1921 Pitman, Henry L. (P) Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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01.03.1921 Louis E. Giles Underwood (P) Computing Machine Comp. : Computing machine
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01.03.1921 Gilles, Louis E. (P) Underwood Computing Machine Comp. : Computing machine
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01.03.1921 Louis E. Giles Underwood (P) Computing Machine Comp. : Computing machine
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01.03.1921 Carl E. Norin Underwood (P) Computing Machine Comp. : Combined typewriting and computing-machine
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01.03.1921 Blaustein, Joseph Controller Comp., Inc. : Calculating machine
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01.03.1921 Gubelmann, William S. (P) : Vertical Ruling Mechanism for Calculating and like Machines
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08.03.1921 Joseph H. Bair Lewis H. Tylor James O. David William C. Haddock : Calculating-machine
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15.03.1921 Martin Teetor Teetor Company : Calculating Machine
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15.03.1921 von Pein, Edward (P) NCR (P) : Cash register
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15.01.1921 Turck, Joseph Abraham Valentine (P) Felt und Tarrant (P) : Calculating Machine
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15.01.1921 Turck, Joseph Abraham Valentine (P) : Calculating Machine
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22.03.1921 F. A. Roddy : Apparatus for Illustrating and Demonstrating the Principles of Pure Arithmetic
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22.03.1921 A. T. Brown : Computing Machine
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29.03.1921 Gubelmann, William S. (P) : Paper Supporting Mechanism for Recording Machines
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29.03.1921 Lake, Clair (P) Tabulating Machine (P) Company : Electric transfer device
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29.03.1921 Crowder Havy Q R : Ellipsograph
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12.04.1921 Poole, Arthur (P) Remington (P) Accounting Machine Comp. : Calculating-machine
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03.05.1921 Julius Duckstine Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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03.05.1921 Lasker, William Walter (P) Powers Accounting Machine Co. : Total taking means for accounting machines
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10.05.1921 Odhner, Valentin Jakob (P) : Transfer mechanism of calculating-machines
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10.05.1921 C. F. Dieckmann Dietzgen (P) : Process of Fastening Non-Metallic Elements to Metal
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17.05.1921 Martin Olaf O Remington Accounting Machine C : Typewriting and calculating machine
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17.05.1921 H. L. Eastman and F. B. Rae : Calculating Device
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24.05.1921 Martin Jr Thomas Pugh : Paper-feed alarm for adding-machines
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24.05.1921 Augustus D. Hargan Western Electric (P) Comp. : Recording key
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24.05.1921 Erich Böhnke : Slide Rule
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24.05.1921 Lake, Clair (P) Tabulating Machine (P) Company : Printing tabulator
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24.05.1921 Tillman, Ferdinand (P) : Calculating attachment for type-writing machines
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07.06.1921 J. P. Van Bogaert : Integraph and Differentiator
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07.06.1921 Goldberg, Hyman Eli (P) Remington (P) Accounting Machine Comp. : Calculating machine
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21.06.1921 Julius Andersson Wictor Oskar : Calculating Machine
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21.06.1921 H. ONeill and S. H. Payne : Slide Rule
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21.06.1921 R. M. Allen : Switching System and Indicating Device therefor
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21.06.1921 Thomas, James (P) Morse Twist Drill und Machine Comp. : Computing device
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28.06.1921 Harry S. Moir : Savings-bank interest-indicator
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05.07.1921 Desire Giot Henri Louis Victor : Star-transit calculator and indicator for mariners
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05.07.1921 Howard Seely Frank : Calculating Device
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05.07.1921 A. S. Dennis : Calculating Machine
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05.07.1921 G. E. Beggs : Aeroplane Bomb Sight
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12.07.1921 Britten, Edwin (P) Monroe (P) Calculating Machine Comp. : Shock-absorber for calculating-machine carriages
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12.07.1921 Phinney, Edgar (P) Monroe (P) Calculating Machine Comp. : Carriage-lock for Calculating-machines
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19.07.1921 J. E. Whitaker : Counter
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26.07.1921 Arthur S. Milinowski : Calculating machine
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02.08.1921 Heber C. Peters Peters-Morse Mfg. Corp. : Adding machine
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02.08.1921 Heber C. Peters Peters-Morce Mfg. Corp. : Adding-machine
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09.08.1921 Charles Birth Wales Adding Machine Comp. : Calculating-machine
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09.08.1921 J. J. Kerr : Planimeter Guide
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09.08.1921 J. D. Robertson : Speedometer
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09.08.1921 Christian Holle, Jr. : Magnifying attachment for slide-rules
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16.08.1921 Meitner, Elemer Ford Instrument Comp., Inc. : Range-predicting apparatus
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16.08.1921 T. Carrol and J. C. Lockyer : Perforating Mechanism for Cash Registers
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23.08.1921 Edward Thomas Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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23.08.1921 Lasker, William Walter (P) Powers Accounting Machine Comp. : Designation printing means
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23.08.1921 Odhner, Valentin Jakob (P) : Supporting means of the ten-pin, hundred-pin, etc., of the calculatingwheels in calculating-machines
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30.08.1921 Lester A. Wernery Underwood (P) Computing Machine Comp. : Combined typewriting and computing machine
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30.08.1921 : Coding and decoding device
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13.09.1921 Degener, Gustave O. (P) Underwood (P) Computing Machine Comp. : Computing-machine
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20.09.1921 W. J. Pasinski : Adding Machine
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20.09.1921 Turck, Joseph Abraham Valentine (P) : Calculating Machine
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20.09.1921 Karl Hoecken : Tens carrying mechanisms of computing machines
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20.09.1921 F. H. Fenwirth : Extension Rule
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04.10.1921 P. J. Jones : Educational Apparatus
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18.10.1921 Edgar Maynard Camp William D. Bleick : Dash-pot
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18.10.1921 Fuller, Frederick (P) NCR (P) : Cash register
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25.10.1921 F. J. Tillman : Calculating Machine
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25.10.1921 Gooch, Claiborne (P) Burroughs (P) Adding Machine Comp. : Adding machine
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25.10.1921 Landsiedel, Harry (P) Dalton (P) Adding Machine Comp. : Recording machine
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01.11.1921 F. H. Thompson : Last Measuring Machine
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08.11.1921 Goldberg, Hyman Eli (P) Remington (P) Accounting Machine Comp. : Calculating machine
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08.11.1921 White, Nelson (P) Monroe (P) Calculating Machine Comp. : Zero setting mechanism
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08.11.1921 E. E. Phinney : Calculating Machine
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08.11.1921 Phinney, Edgar (P) Monroe (P) Calculating Machine Comp. : Crank-handle latch
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15.11.1921 A. H. Hawley : Accounting Machine with Auxiliary Printing Appliance
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15.11.1921 Wahl, John C. (P) : Calculating Machine
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22.11.1921 Henry Muller : Calculating device
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22.11.1921 Muller, Robert (P) : Adding Machine
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22.11.1921 Thomas J. Dalzell : Calculating device
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22.11.1921 Doerr, Fred (P) : Computing Machine
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22.11.1921 Goldberg, Hyman Eli (P) (Now by judicial Change of Name H. Golber) : Algebraic Total Calculating Machine
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22.11.1921 Shipley, Bernis (P) : Cash Register
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29.11.1921 Pierce Robert A : Slide-rule
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29.01.1921 Rechnitzer, Alexander (P) : Calculating Machine
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06.12.1921 Trinks, Franz (P) : Paper-strip feed for adding-machines
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06.12.1921 E. E. Phinney : Setting up Means for Calculating Machines
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13.12.1921 Schaller, Carl (P) Grimme, Natalis u. Co. (P) : Calculating machine
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13.12.1921 Trinks, Franz (P) : Calculating Machine
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13.12.1921 Trinks, Franz (P) : Adding Machine
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13.12.1921 Andrew C. Wood Stewart-Warner Speedometer Corp. : Revolution-counter resetting
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13.12.1921 M. B. And V. C. Kennedy : Computing Machine
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20.12.1921 Harry H. Vickers Underwood (P) Computing Machine Comp. : Combined typewriting- and computing machine
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27.12.1921 Oscar Woodward Remington (P) Accounting Machine Comp. : Computing-machine
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27.12.1921 W. E. Harris : Calculating Device
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17.02.1921 R. W. Hook : Adding Machine
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11.10.1921 N. A. Shipherd : Computing apparatus