Patent
Patentdatenbank USA 1871
- Patent:US113794 18.04.1871 Charles W. Pyle : Improvement in Counting-registers
- Patent:US115318 30.05.1871 Edwin A. Hickman : Improvement in apparatus for illustrating trigonometry
- Patent:US117169 18.07.1871 E. M. Hamilton : Adding Machine
- Patent:US119871 10.10.1871 C. C. Marsh : Instrument for averaging Accounts
- Patent:US120609 07.11.1871 Alexander P. Atkinson : Improvement in counting-registers