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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US3419972


Patent:US 3419972
Title:Educational Aid ...
Date:07.01.1969
Place:
Country:USA
Person:J. A. Kitzinger
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US3419972 (espacenet),  US3419972 (uspto)


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