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Patent:US3387392


Patent:US 3387392
Title:Abacus with Mechanical Means for Holding Unit Counters in Position
Date:11.06.1968
Place:
Country:USA
Person:D. A. Kurz
Company:
Internal Links:Kugelrechner
Keywords:
Link to the patent office:
(without guarantee)
 US3387392 (espacenet),  US3387392 (uspto)


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