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Patent:US2077523


Patent:US 2077523
Title:Apparatus for calculating trigonometric problems
Date:20.04.1937
Place:
Country:USA
Person:Hug Fritz A
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US2077523 (espacenet),  US2077523 (uspto)


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Aus der Patentschrift US2077523