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Patent:US1392578


Patent:US 1392578
Title:Educational Apparatus
Date:04.10.1921
Place:
Country:USA
Person:P. J. Jones
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US1392578 (espacenet),  US1392578 (uspto)


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Aus der Patentschrift US1392578