Title:
Microphone
United States Patent 1678842


Inventors:
Aiken, Joseph E.
Application Number:
US72047724A
Publication Date:
07/31/1928
Filing Date:
06/17/1924
Assignee:
WESTINGHOUSE ELECTRIC & MFG CO
Primary Class:
Other Classes:
181/242
International Classes:
H04R1/34
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