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Patent:US6056553


Patent:US 6056553
Title:Apparatus for math teaching and self-learning
Date:02.05.2000
Place:
Country:USA
Person:Huang, Pingsheng (20 Alpine Rd., Towaco, NJ 07082)
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US6056553 (espacenet),  US6056553 (uspto)


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