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Patent:US4419081


Patent:US 4419081
Title:Mathematical teaching/learning aid and method of use
Date:06.12.1983
Place:6928 E. Sunnyvale Rd., Scottsdale
Country:USA
Person:Steinmann, Phyllis R.
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US4419081 (espacenet),  US4419081 (uspto)


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Aus der Patentschrift US4419081