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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US651275


Patent:US 651275
Title:Arithmetical Slate
Date:18.10.1899
Place:
Country:USA
Person:H. C. Seiler
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US651275 (espacenet),  US651275 (uspto)


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