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Patent:US4416633


Patent:US 4416633
Title:Educational and recreational mathematical device in the form of a band,
Date:22.11.1983
Place:880 Fifth Ave., New York, NY 10021
Country:USA
Person:Gulack, Max A.
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US4416633 (espacenet),  US4416633 (uspto)


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Aus der Patentschrift US4416633