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Patent:US4257174


Patent:US 4257174
Title:Device for teaching counting
Date:24.03.1981
Place:
Country:USA
Person:Presley, Wayman R. (RFD #1, Makanda, IL 62958)
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US4257174 (espacenet),  US4257174 (uspto)


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Aus der Patentschrift US4257174