Patent
Patentdatenbank USA 1875
- Patent:US158853 19.01.1875 Horace B. Martin : Mechanical Calculators
- Patent:US159244 02.01.1875 Baldwin, Frank Stephen (P) : Calculating-machine
- Patent:US160349 02.03.1875 Charles E. Rand John T. Dupont : Improvement in registering-machines
- Patent:US165964 27.07.1875 A.C. Wellmann : Calculator
- Patent:US168080 28.09.1875 Edmund D. Barbour : Calculating-machine
- Patent:US170708 07.12.1875 Butt, Dennis L. (P) : Improvement in adding-machines