Sound translating device
United States Patent 1895441
Inventors:
Bostwick, Lee G.
Publication Date:
01/31/1933
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Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
Other Classes:
381/405, 381/426, 381/432
International Classes:
H04R7/12; H04R9/02; H04R9/04; H04R7/00; H04R9/00