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Patent:US1993834


Patent:US 1993834
Title:Calculating Machine
Date:12.03.1935
Place:
Country:USA
Person:Friden, Carl Mauritz Fredrick (P)
Company:Marchant (P) Calculating Machine Company
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US1993834 (espacenet),  US1993834 (uspto)


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Aus der Patentschrift US1993834