Electroacoustic apparatus
United States Patent 2305626
Inventors:
Royal, Lee
Publication Date:
12/22/1942
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Assignee:
Royal, Lee
Primary Class:
Other Classes:
336/119, 336/77, 336/129, 369/129, 330/61R
International Classes:
H03C5/00; H04R9/08; H04R9/00