SOUND MONITOR INTRUDER ALARM SYSTEM
United States Patent 3513463
US Patent References:
Alarm system
- - 2071933

Method and apparatus for detecting motion in a confined space
- - 2655645

Object detectors
- - 2826753

Sonic alarm system
- - 3061829

Alarm system
- - 3134970


Inventors:
Stevenson Jr., Louis A.
Mickley Jr., Lou D.
Publication Date:
05/19/1970
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Assignee:
AUTOMATIC SPRINKLER CORP
Primary Class:
340/521
Other Classes:
367/93, 340/566
International Classes:
G08B13/16; G08B13/16
US Patent References:
3276006Audio accumulator




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