Noise masking installation
United States Patent 3298455
US Patent References:
/0811140.html
- - 0811140

Alarm device for safes
- - 2001812

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- - 3104543

Secure conference systems
- - 3229429


Inventors:
Kodaras, Michael J.
Duda, John F.
Publication Date:
01/17/1967
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Assignee:
ELOF HANSSON INC
Primary Class:
181/141
Other Classes:
181/30
International Classes:
G10K11/175; G10K11/00