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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US1161381


Patent:US 1161381
Title:Calculator
Date:23.11.1915
Place:Chevy Chase, ND
Country:USA
Person:Charles Hugh Duffy
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US1161381 (espacenet),  US1161381 (uspto)


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