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Die große Enzyklopädie des mechanischen Rechnens

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Patents  USA  1857

 
  • Patent:US18675 24.11.1857 Orlando L. Castle, Upper Alton, Ill. : Arithmometer for Addition
  • Patent:US18692 24.11.1857 Thomas Hill : Arithmometer
  • Patent:US18711 24.11.1857 James D. Smith, Brantingham, N.Y. : Calculating Device

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