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Patent:US418930
01.00.1989 Jacob H. Schnarrenberger Thomas Reynolds : Adding and subtracting machine
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Patent:US424574
04.00.1989 Emil J.F. Quirin : Tabular calculator
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Patent:US424932
04.00.1989 James F. Mays I. Berry De Kalb Turbeville : Adding-machine
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Patent:US433728
08.00.1989 Charles E. Hadley Kruse Check and Adding Machine Comp. : Cash-recording machine
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Patent:US4797539
10.01.1989 Forest, Guy A. (942, Nicole-Lemaire, Boucherville, Qc, CA) : Alcoholic concentration indicator
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17.01.1989 Salvo, Gaetano : Manual calculator for analog and digital numbers
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14.03.1989 Colodner, Jesse (P) : Hexadecimal abacus
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09.02.1989 Carney, Thomas (P) NCR (P) : Complete-stroke mechanism for cash-registers
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09.02.1989 Cook, Hugo (P) : Cash Register, Indicator and Recorder
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30.05.1989 Rogers, Raymond E. (11996 Scenic Hwy., #109, Pensacola, FL : Diving computer
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00.02.1989 Edward F. Roberts Roberts Mfg. Comp. : Cash-register
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08.08.1989 McLain, Philippe H. : Navigational and yacht racing calculator
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01.02.1989 John E. Claudin Paul Robert Joseph R. Claudin : Cash register and adder
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21.11.1989 Sigman, Susan J. (West Lafayette, IN), Meade, Paula A. : Fluoride supplement calculator
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28.11.1989 Laisure, Thomas J. : Educational board game for teaching mathematics and logic
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05.12.1989 Pak, Kyoungsik : Mathematic teaching aid
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12.12.1989 Roman, Robert (P) : Mechanical analog computer device
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01.03.1989 William P. Huffman : Cash-register
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05.03.1989 Carney, Thomas (P) NCR (P) : Cash-register
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01.04.1989 Weiss, Carl (P) NCR (P) : Cash register
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01.04.1989 Weiss, Carl (P) : Motor-driven cash-register and check-printer
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07.04.1989 Cyrus Price : Cash register and indicator
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02.05.1989 James M. Clark : Game-counter
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07.05.1989 Brandt, Edward J. (P) : Coin delivery apparatus
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01.05.1989 Aeilt A. Lutterman : Cash-register
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09.06.1989 Edward T. Taylor : Cash register and indicator
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03.07.1989 Moses Isaacs : Ruler and time-computing device
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06.07.1989 Labofish, Charles S. (P) Charles R. Harris : Cyclometer
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06.07.1989 Cleal, Joseph P. (P) NCR (P) : Cash Register
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08.07.1989 Cleal, Joseph P. (P) NCR (P) : Cash Register and Indicator
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09.07.1989 Alvan Macauley NCR (P) : Cash-register
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00.07.1989 Felt, Dorr E. (P) : Duplicate-printing mechanism for adding-machines
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00.07.1989 Robert Duncan : Mechanical calculator
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05.08.1989 James E.G. Yalden : Slide Rule
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06.08.1989 Grant, George B. (P) : Calculating-machine
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09.08.1989 Ferdinand A. Hassler : Word-register for type-writing machines
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09.08.1989 McCormick, John H. (P) Hallwood Cash Register Comp. : Cash register and indicator
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09.08.1989 McCormick, John H. (P) Hallwood Cash Register Comp. : Cash register and indicator
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09.08.1989 McCormick, John H. (P) : Cash-register
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02.08.1989 Francis C. Osborn Osborn Cash Register Comp. Ltd. : Cash register
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02.09.1989 Dement, Isaac S. (P) Charles F. Bassett : Mechanical cashier
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04.09.1989 Hollerith, Herman (P) : Adding and recording machine
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06.09.1989 Charles H. Boehl : Device for proving addition
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07.09.1989 Patrick J. O Connor : Confessional-register