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Patent:US1532011


Patent:US 1532011
Title:Arithmetic Teaching Device
Date:31.03.1925
Place:
Country:USA
Person:R. M. Williamson
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US1532011 (espacenet),  US1532011 (uspto)


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Aus der Patentschrift US1532011