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Patent:US1488686


Patent:US 1488686
Title:Log Log Duplex Slide Rule
Date:01.04.1924
Place:
Country:USA
Person:Keuffel, Adolf W. (P)
Company:
Internal Links:Rechenschieber
Keywords:
Link to the patent office:
(without guarantee)
 US1488686 (espacenet),  US1488686 (uspto)


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Aus der Patentschrift US1488686