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Patent:US1632505


Patent:US 1632505
Title:Slide Rule
Date:14.06.1927
Place:
Country:USA
Person:H. Ritow
Company:
Internal Links:Rechenschieber
Keywords:
Link to the patent office:
(without guarantee)
 US1632505 (espacenet),  US1632505 (uspto)


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Aus der Patentschrift US1632505