Title:
Automatic sound control
United States Patent 3098121
US Patent References:
Noise operated automatic volume control
- - 2501327
Hearing aid device
- - 2891116
Ear protector and communication equipment
- - 2946862
Noise reduction system
- - 2972018
Noise operated automatic volume control
- - 2501327
Hearing aid device
- - 2891116
Ear protector and communication equipment
- - 2946862
Noise reduction system
- - 2972018
Inventors:
Wadsworth, William B.
Publication Date:
07/16/1963
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Export Citation:
Assignee:
DAVID CLARK COMPANY INC
Primary Class:
International Classes:
H03G3/32