Title:
Electromagnetic sound recording
United States Patent 2245286
Inventors:
Luigi, Marzocchi
Publication Date:
06/10/1941
Export Citation:
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Assignee:
Luigi, Marzocchi
Primary Class:
360/84
Other Classes:
346/139A, 360/83, 360/122, 369/97
International Classes:
G11B5/53
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