Patente aus den USA 1891
- Patent:US444391 06.01.1891 Clark, William Lovell Mfg. Comp. : Cash register and indicator
- Patent:US460930 06.01.1891 Cox, William : Engineers Slide Rule
- Patent:US445240 27.01.1891 Corbin, Royal : Adding machine
- Patent:US445447 27.01.1891 Hart, Henry C. : Calculating machine
- Patent:US445671 03.02.1891 H. Cook : Cash Register and Indicator
- Patent:US445959 03.02.1891 M. N. Lovell : Cash Register and Indicator
- Patent:US446262 10.02.1891 Gideon B. Massey : Cash-register and check machine
- Patent:US446753 17.02.1891 Eri F. Jewett Percy L. Jewett : Adding machine
- Patent:US446882 24.02.1891 P. OMarra : Surveyors Plotting Instrument
- Patent:US447335 03.03.1891 Lewis, Isaac : Range and position Finder
- Patent:USRE11147 03.03.1891 A. C. Ludlum : Adding and Writing Machine
- Patent:USRE11147E1 03.03.1891 Ludlum, Albert C. : Adding and Writing Machine
- Patent:US448221 17.03.1891 George B. Gates : Adding-machine
- Patent:US448278 17.03.1891 S. J. Taylor : Change Maker and Automatic Register
- Patent:US448937 24.03.1891 Cook, Hugo : Cash Register and Indicator
- Patent:US449248 31.03.1891 R. E. Nelson Jr. : Cash Register
- Patent:US449311 31.03.1891 Cook, Hugo : Cash register, recorder, and indicator
- Patent:US449328 31.03.1891 M. R. Longacre : Cash Registering and Indicating Machine
- Patent:US449395 31.03.1891 John H. Ahrens : Cash-register
- Patent:US450039 07.04.1891 Root, Charles : Counting Register
- Patent:US450141 14.04.1891 J. A. Cook : Telescopic Rule
- Patent:US450640 21.04.1891 R. C. Smith : Slide Rule for Logarithmic Calculations
- Patent:US450814 21.04.1891 J. Mathison : Adding and Recording Machine
- Patent:US451967 12.05.1891 J. W. Wright : Adding Machine
- Patent:US451993 12.05.1891 George Charles Bateman Richard Shepeard : Game-counter for billiard tables
- Patent:US452302 12.05.1891 J. Denison : Device for Teaching Arithmetic
- Patent:US452402 19.05.1891 James L. Townsley Kenwood Mfg. Comp. : Cash register and indicator
- Patent:US452446 19.05.1891 Atwood, George F. : Adding machine
- Patent:US453778 09.06.1891 Shattuck, Arthur : Adding Machine
- Patent:US454597 23.06.1891 W. N. Cuthbert : Blackboard &c
- Patent:US454715 23.06.1891 Craig, Dudley I. : Adding machine
- Patent:US454838 30.06.1891 Joseph E. Blackshaw George H. Rogers : Adding machine
- Patent:US454990 30.06.1891 Sern Perley Watt Columbus Cash Register Comp. : Cash register and indicator
- Patent:US455111 30.06.1891 Francis C. Osborn : Cash register and indicator
- Patent:US455161 30.06.1891 James L. Brown : Pocket cash-register
- Patent:US456177 21.07.1891 Weiss, Carl W. : Locking device for indicating, registering and adding mechanisms
- Patent:US456196 21.07.1891 James Locher : Automatic stop for number-registers
- Patent:US456419 21.07.1891 W. F. Lawrenz : Adding Machine
- Patent:US456869 28.07.1891 Watkins, Alfred : Instrument for calculating photographic exposures
- Patent:US457140 04.08.1891 Weiss, Carl W. : Check printing and adding machine
- Patent:US457717 11.08.1891 J. M. W. Hicks : Calendar
- Patent:US457726 11.08.1891 Kolb, George F. : Cash register and indicator
- Patent:US458203 25.08.1891 Weiss, Carl W. Kruse Cash Register Comp. : Check printing and adding machine
- Patent:US458968 01.09.1891 A.B. Calkins : Polar Planimeter
- Patent:US463027 15.10.1891 Blackshaw, Joseph E. und Rogers, George H. : Adding machine
- Patent:US462334 03.11.1891 A. Slavin : Adding Machine
- Patent:US462384 03.11.1891 Rumble, Harry Humfrey : Adding Machine
- Patent:US462405 03.11.1891 Hallett, William W. : Device for instruction in reading and calculating
- Patent:US463070 10.11.1891 Henry McKee, George George B. Howle; Albert S. Harrell : Calendar
- Patent:US464261 01.12.1891 William H. Beehler : Instrument for taking nautical observations
- Patent:US465120 15.12.1891 Webb, Charles Henry : Adding Machine
- Patent:US465255 15.12.1891 Felt, Dorr E. : Recording Computing Machine
- Patent:US465294 15.12.1891 Ross, David : Calendar
- Patent:US465689 22.12.1891 A. W. Bradley Jr. : Ellipsograph
- Patent:US465811 22.12.1891 O. W. Anderson : Adding Machine
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