Alarm device
United States Patent 3378830
US Patent References:
/1012590.html
- - 1012590

/1146883.html
- - 1146883

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- - 1226009

/1305190.html
- - 1305190

Electric signaling device
- - 2634409


Inventors:
Patrick, George D.
Publication Date:
04/16/1968
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Primary Class:
340/546
Other Classes:
200/61.810
International Classes:
G08B13/08; G08B13/02
US Patent References:
2838747Door-alarm
2922150Door alarm
3270333Portable closure alarm having compensating support bracket