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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US3481537


Patent:US 3481537
Title:Easy Calculator
Date:02.12.1969
Place:
Country:USA
Person:Welch Norman Floyd
Company:Norman Floyd Welch
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US3481537 (espacenet),  US3481537 (uspto)


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Aus der Patentschrift US3481537