Title:
Hold-up alarm signal system
United States Patent 2766358
US Patent References:
Radio alarm system
- - 1497194
Burglar alarm
- - 1888371
Alarm system for banks and the like
- - 1946781
Method and means for reporting interference with vehicles
- - 1993497
/2105286.html
- - 2105286
Radio alarm system
- - 1497194
Burglar alarm
- - 1888371
Alarm system for banks and the like
- - 1946781
Method and means for reporting interference with vehicles
- - 1993497
/2105286.html
- - 2105286
Inventors:
Davidson, William H.
Publication Date:
10/09/1956
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Export Citation:
Assignee:
DAVIDSON SIGNAL CO LTD
Primary Class:
Other Classes:
340/539.110, 340/539.100, 340/574, 200/303, 340/303, 361/182
International Classes:
G08B13/22
US Patent References: