Title:
Electric system for recording and reproducing sound
Document Type and Number:
United States Patent 1860502
Inventors:
Hansen, Edmund H.
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Publication Date:
05/31/1932
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Export Citation:
Assignee:
Hansen, Edmund H.
Primary Class:
Other Classes:
250/208.200, 318/47, 318/723, 369/110.010, 346/107.100, 226/9
International Classes:
G03B31/00