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Patent:US3531877


Patent:US 3531877
Title:Ratio and Proportion Demonstrating Unit
Date:06.10.1970
Place:
Country:USA
Person:J. E. Miller
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US3531877 (espacenet),  US3531877 (uspto)


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Aus der Patentschrift US3531877