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Patent:US2910786


Patent:US 2910786
Title:Calculating device for teaching arithmetic
Date:03.11.1959
Place:
Country:USA
Person:Howard Healey, Cohn Irwin
Company:Great American Plastics Co
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US2910786 (espacenet),  US2910786 (uspto)


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Aus der Patentschrift US2910786