Patent
Patentdatenbank 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