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Patent:US3995378


Patent:US 3995378
Title:Mathematics visual teaching aid
Date:07.12.1976
Place:
Country:USA
Person:Darnell, Eula K. (307 Baldwin, West Helena, AR 72390)
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US3995378 (espacenet),  US3995378 (uspto)


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Aus der Patentschrift US3995378