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Patent:US2457332


Patent:US 2457332
Title:Educational Apparatus
Date:28.12.1948
Place:
Country:USA
Person:Wade, F. A. (P) et al
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US2457332 (espacenet),  US2457332 (uspto)


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Aus der Patentschrift US2457332