Title:
Blast-proof water-proof loudspeaker
United States Patent 3073916

Inventors:
Williams, Philip B.
Allen, Harry E.
Hohmann, Charles R.
Publication Date:
01/15/1963
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Assignee:
MUTER COMPANY
Primary Class:
381/189
Other Classes:
181/157, 381/395, 367/175, 381/403
International Classes:
H04R9/04; H04R9/06; H04R9/00
Foreign References:
DE899674C
FR1126904A
FR1136866A