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Die große Enzyklopädie des mechanischen Rechnens

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Search results for: Rapid Calculator Co.


 
  • 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

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