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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US1294157


Patent:US 1294157
Title:Calculating machine
Date:11.02.1919
Place:Chicago und Wilmington, DE
Country:USA
Person:Poole, Arthur (P)
Company:Wahl (P) Comp.
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Keywords:
Link to the patent office:
(without guarantee)
 US1294157 (espacenet),  US1294157 (uspto)


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