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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US2418948


Patent:US 2418948
Title:Calculating Device
Date:15.04.1947
Place:
Country:USA
Person:Ludwig, C. L. (P)
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US2418948 (espacenet),  US2418948 (uspto)


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