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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US997483


Patent:US 997483
Title:Mechanical calculator
Date:11.07.1911
Place:Norwood, OH, USA
Country:USA
Person:Webner, Frank E. (P)
Company:American Mechanical Calculator Company
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US997483 (espacenet),  US997483 (uspto)


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