Alarm and annunciator system
United States Patent 2709250
US Patent References:
Manual fire alarm system
- - 2278939
Brake pressure responsive signal system
- - 2439474
Boiler level alarm system
- - 2493548
Electric alarm system
- - 2501793
Annunciator system
- - 2600132
Manual fire alarm system
- - 2278939
Brake pressure responsive signal system
- - 2439474
Boiler level alarm system
- - 2493548
Electric alarm system
- - 2501793
Annunciator system
- - 2600132
Inventors:
Marmorstone, Robert J.
Publication Date:
05/24/1955
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Export Citation:
Assignee:
PANELLIT INC
Primary Class:
Other Classes:
340/692, 340/313
International Classes:
G08B25/01