Patent
Suchergebnisse für: Rapid Calculator Co.
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- Patent:US1508257 08.11.1919 Rosenthal, Richard (P), Schuman, Otto P. (P) Rapid Calculator Co. (P) : Calculating Machine
- Patent:US1566978 29.08.1924 Schuman, Otto P. (P) Rapid Calculator Co. (P) : Clearing Device for Setting Disks of Calculating Machines