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Patent
Patentdatenbank USA 1866
- Patent:US51972 09.01.1866 Newton Rowland, Hilltown, Pa. : Calculating machine
- Patent:US52681 20.02.1866 Samuel Comfort : Improvement in counting-machines
- Patent:US58347 25.09.1866 S.J. Kelso, ass. to S.J. Kelso and J. Edgar : Improvement in ciphering-machines
- Patent:US60475 18.12.1866 John H. Chidester, Cleveland, Ohio : computing machine