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Patent:US6129551


Patent:US 6129551
Title:Mathematical graph board
Date:10.10.2000
Place:2617 Roosevelt Ave. #79, San Antonio, TX
Country:USA
Person:Martin, Lowry G.
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)		 US6129551 (espacenet),  US6129551 (uspto)


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Aus der Patentschrift US6129551

A new mathematical graph board for teaching linear equations and linear inequalities.