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Patent:US5281144


Patent:US 5281144
Title:Math facts game apparatus
Date:25.01.1994
Place:715 Cypress St., Ravenswood, WV 26164
Country:USA
Person:Pease, Crystal R.
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US5281144 (espacenet),  US5281144 (uspto)


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Aus der Patentschrift US5281144