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Patent:US3633287


Patent:US 3633287
Title:Numerical Base System Teaching Device
Date:11.01.1972
Place:
Country:USA
Person:Fitz A. Squires
Company:
Internal Links:Lehrmittel, Kugelrechner
Keywords:
Link to the patent office:
(without guarantee)
 US3633287 (espacenet),  US3633287 (uspto)


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Aus der Patentschrift US3633287