Sound recording and reproducing system
United States Patent 2114471

Inventors:
Keller, Arthur C.
Mount, Vernon
Rafuse, Irad S.
Publication Date:
04/19/1938
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Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
369/86
Other Classes:
369/91, 369/136, 369/132
International Classes:
H04R9/16; H04R11/12; H04R9/00; H04R11/00