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Patent:US3412470


Patent:US 3412470
Title:Educational Device
Date:26.11.1968
Place:
Country:USA
Person:R. C. Williams et al.
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US3412470 (espacenet),  US3412470 (uspto)


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Aus der Patentschrift US3412470