Patent
Patentdatenbank USA 1877
- Patent:US187114 06.02.1877 C. C. Fields : Adding Pencil
- Patent:US189979 24.04.1877 L. Wieser : Arithmetical Toy
- Patent:US192828 10.07.1877 Richard M. Hoe : Improvement in billiard-registers
- Patent:US193425 24.07.1877 Smith, Marshall M. (P) : Improvement in adding machines
- Patent:US193853 07.08.1877 M.M. Cram : adding machine
- Patent:US195281 18.09.1877 Hofer, William L. (P) : Improvement in adding-machines
- Patent:US196499 23.10.1877 Tabony, Joseph H. Paul Pizzini : Improvement in game-counters