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Patent:US5674075


Patent:US 5674075
Title:Math teaching unit
Date:07.10.1997
Place:
Country:USA
Person:Sherman, Betty E. (P.O. Box 196, Buford, GA 30518)
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US5674075 (espacenet),  US5674075 (uspto)


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