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Patent:US5823783


Patent:US 5823783
Title:Rotating pie graph: mathematics learning tool
Date:20.10.1998
Place:P. O. Box 3040, Youngstown, OH
Country:USA
Person:Adams, Mary Katherine
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US5823783 (espacenet),  US5823783 (uspto)


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