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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US1641615


Patent:US 1641615
Title:Calculating machine
Date:06.09.1927
Place:Sommerda
Country:USA
Person:Berk, Richard
Company:Rheinmetall (P) (Rheinische Metallwaaren- und Rechenmaschinenfabrik)
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Link to the patent office:
(without guarantee)
 US1641615 (espacenet),  US1641615 (uspto)


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