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Die große Enzyklopädie des mechanischen Rechnens

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Patents  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

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