Patent
Patentdatenbank USA 1874
- Patent:US146407 13.01.1874 Spalding, Cyrus G. (P) : Adding Machine
- Patent:US149474 07.04.1874 H. A. Hazen : Ellipsographs
- Patent:US150973 19.05.1874 Philo F. Pettibone : Improvement in tax-calculators
- Patent:US152670 30.06.1874 C.C. Moore & J.B. Moore : Adding Machine
- Patent:US153475 28.07.1874 Edwin Chesterman : Improvement in passenger enumerators and classifiers
- Patent:US153522 28.07.1874 Baldwin, Frank Stephen (P) : Improvement in Adding Machines
- Patent:US153826 04.08.1874 C. J. Holman : Adding Machine
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- Patent:US157690 14.12.1874 Lawrence, John M. (P) : Improvement in adding-machines