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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US922465


Patent:US 922465
Title:Calculating Device
Date:25.05.1909
Place:
Country:USA
Person:R. H. Fenn
Company:
Internal Links:Rechenscheibe logarithmisch
Keywords:
Link to the patent office:
(without guarantee)
 US922465 (espacenet),  US922465 (uspto)


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Aus der Patentschrift US922465