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Patent:US2585458


Patent:US 2585458
Title:Game apparatus for teaching the use of the multiplication table
Date:12.02.1952
Place:
Country:USA
Person:Gordon Julia
Company:
Internal Links:Lehrmittel, Multipliziertafel
Keywords:
Link to the patent office:
(without guarantee)
 US2585458 (espacenet),  US2585458 (uspto)


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Aus der Patentschrift US2585458