Title:
Acoustic device
United States Patent 2107757
Inventors:
Kinsley, Thomas G.
Publication Date:
02/08/1938
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Export Citation:
Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
Other Classes:
181/159, 181/144, 381/186, 381/391
International Classes:
H04R1/24; H04R1/22