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Patent:US5989035


Patent:US 5989035
Title:Arithmetic teaching device
Date:23.11.1999
Place:
Country:USA
Person:Okoye, Godwin (P.O. Box 4605, Albuquerque, NM 87196)
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US5989035 (espacenet),  US5989035 (uspto)


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