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Patent:US2968438


Patent:US 2968438
Title:Slide rules
Date:17.01.1961
Place:Stein, near Nurnberg und Geroldsgrun und Stein
Country:USA
Person:Harald Bachmann Heinrich Tegtmeyer
Company:A.W.Faber-Castell (P)
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Link to the patent office:
(without guarantee)
 US2968438 (espacenet),  US2968438 (uspto)


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