Patent
Patentdatenbank USA 1870
- Patent:US100288 01.03.1870 Groesbeck, John (P) : Adding Machine
- Patent:US102034 19.04.1870 Nels Ockerlund : Improvement in rule and calculator
- Patent:US102216 26.04.1870 Alexander Brodie : Improvement in Calculators
- Patent:US103221 17.05.1870 William H. McNary : Counting register
- Patent:US104368 14.06.1870 Luther Smith James A. Pevey : Improvement in log-measuring scale
- Patent:US105717 26.07.1870 Nels Ockerlund : Improvement in adding-machine
- Patent:US106701 23.08.1870 F. T. Leilich : Adding Machine
- Patent:US106881 30.08.1870 Spear, Charles E. (P) : Improvement in adding-machine
- Patent:US106999 06.09.1870 Gilbert W. Chapin : Improvement in adding-machines
- Patent:US109619 29.11.1870 Henry A. House : Calculating Device
- Patent:US110520 27.12.1870 F.F. Warner : Adding Machine
- Patent:US98720 11.01.1870 Swain, Edward Augustus (P) : Improvement in adding-machine
- Patent:US99226 25.01.1870 H. Parmelee : adding machine
- Patent:US99533 08.02.1870 Gilbert W. Chapin : adding machine