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Patent:US6155836


Patent:US 6155836
Title:System for teaching mathematics
Date:05.12.2000
Place:
Country:USA
Person:Hancock, Tapp (8000 Kroll Way #2, Bakersfield, CA 93311)
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US6155836 (espacenet),  US6155836 (uspto)


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