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Patent:US3129628


Patent:US 3129628
Title:Music Teaching Device
Date:21.04.1964
Place:
Country:USA
Person:R. Hall
Company:
Internal Links:Musik, Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US3129628 (espacenet),  US3129628 (uspto)


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Aus der Patentschrift US3129628