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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US2228274


Patent:US 2228274
Title:Calculating Device
Date:14.01.1941
Place:
Country:USA
Person:M. W. La Fever
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US2228274 (espacenet),  US2228274 (uspto)


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Aus der Patentschrift US2228274