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Patent:US1667449


Patent:US 1667449
Title:Magnifying device for slide rules
Date:24.04.1928
Place:Geroldsgrun und Stein, near Nuremberg
Country:USA
Person:Fritz Wömpner
Company:A.W.Faber-Castell (P)
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Link to the patent office:
(without guarantee)
 US1667449 (espacenet),  US1667449 (uspto)


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