Device and method for recording sound waves
United States Patent 1889380

Inventors:
Samuel, Ruben
Publication Date:
11/29/1932
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Assignee:
Samuel, Ruben
Primary Class:
346/74.300
Other Classes:
336/219, 427/127, 427/58, 346/74.200, 252/62.530, 29/602.100, 29/DIG.028, 106/241, 360/131
International Classes:
G11B5/00; G11B5/845