Patente aus den USA 1989
- Patent:US418930 01.00.1989 Jacob H. Schnarrenberger Thomas Reynolds : Adding and subtracting machine
- Patent:US424574 04.00.1989 Emil J.F. Quirin : Tabular calculator
- Patent:US424932 04.00.1989 James F. Mays I. Berry De Kalb Turbeville : Adding-machine
- Patent:US433728 08.00.1989 Charles E. Hadley Kruse Check and Adding Machine Comp. : Cash-recording machine
- Patent:US4797539 10.01.1989 Forest, Guy A. (942, Nicole-Lemaire, Boucherville, Qc, CA) : Alcoholic concentration indicator
- Patent:US4798940 17.01.1989 Salvo, Gaetano : Manual calculator for analog and digital numbers
- Patent:US483946 00.02.1989 Edward F. Roberts Roberts Mfg. Comp. : Cash-register
- Patent:US486030 01.02.1989 John E. Claudin Paul Robert Joseph R. Claudin : Cash register and adder
- Patent:US480367 08.02.1989 William W. Hallett : Machine for calculating and illustrating longitude and time
- Patent:US482161 09.02.1989 Carney, Thomas NCR : Complete-stroke mechanism for cash-registers
- Patent:US482165 09.02.1989 Cook, Hugo : Cash Register, Indicator and Recorder
- Patent:US489228 01.03.1989 William P. Huffman : Cash-register
- Patent:US496855 05.03.1989 Carney, Thomas NCR : Cash-register
- Patent:US4812124 14.03.1989 Colodner, Jesse : Hexadecimal abacus
- Patent:US512639 01.04.1989 Weiss, Carl NCR : Cash register
- Patent:US512641 01.04.1989 Weiss, Carl : Motor-driven cash-register and check-printer
- Patent:US522389 07.04.1989 Cyrus Price : Cash register and indicator
- Patent:US549203 01.05.1989 Aeilt A. Lutterman : Cash-register
- Patent:US533436 02.05.1989 James M. Clark : Game-counter
- Patent:US542328 07.05.1989 Brandt, Edward J. : Coin delivery apparatus
- Patent:US4835371 30.05.1989 Rogers, Raymond E. (11996 Scenic Hwy., #109, Pensacola, FL : Diving computer
- Patent:US566878 09.06.1989 Edward T. Taylor : Cash register and indicator
- Patent:US590972 00.07.1989 Felt, Dorr E. : Duplicate-printing mechanism for adding-machines
- Patent:US591332 00.07.1989 Robert Duncan : Mechanical calculator
- Patent:US578149 03.07.1989 Moses Isaacs : Ruler and time-computing device
- Patent:US583491 06.07.1989 Labofish, Charles S. Charles R. Harris : Cyclometer
- Patent:US583889 06.07.1989 Cleal, Joseph P. NCR : Cash Register
- Patent:US587298 08.07.1989 Cleal, Joseph P. NCR : Cash Register and Indicator
- Patent:US589476 09.07.1989 Alvan Macauley NCR : Cash-register
- Patent:US615409 02.08.1989 Francis C. Osborn Osborn Cash Register Comp. Ltd. : Cash register
- Patent:US603370 05.08.1989 James E.G. Yalden : Slide Rule
- Patent:US605288 06.08.1989 George B. Grant : Calculating-machine
- Patent:US4855577 08.08.1989 McLain, Philippe H. : Navigational and yacht racing calculator
- Patent:US610181 09.08.1989 Ferdinand A. Hassler : Word-register for type-writing machines
- Patent:US610365 09.08.1989 McCormick, John H. Hallwood Cash Register Comp. : Cash register and indicator
- Patent:US610366 09.08.1989 McCormick, John H. Hallwood Cash Register Comp. : Cash register and indicator
- Patent:US610492 09.08.1989 McCormick, John H. : Cash-register
- Patent:US618932 02.09.1989 Dement, Isaac S. Charles F. Bassett : Mechanical cashier
- Patent:US622470 04.09.1989 Hollerith, Herman : Adding and recording machine
- Patent:US626524 06.09.1989 Charles H. Boehl : Device for proving addition
- Patent:US628229 07.09.1989 Patrick J. O Connor : Confessional-register
- Patent:US4882472 21.11.1989 Sigman, Susan J. (West Lafayette, IN), Meade, Paula A. : Fluoride supplement calculator
- Patent:US4883277 28.11.1989 Laisure, Thomas J. : Educational board game for teaching mathematics and logic
- Patent:US4884973 05.12.1989 Pak, Kyoungsik : Mathematic teaching aid
- Patent:US4886458 12.12.1989 Roman, Robert : Mechanical analog computer device
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