Title:
Room status indicating system
United States Patent 3228020
Inventors:
Irvin, Gassenheimer
Gassenheimer Jr., Irvin
Publication Date:
01/04/1966
Export Citation:
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Assignee:
Irvin, Gassenheimer
Gassenheimer Jr., Irvin
Primary Class:
340/286.08
Other Classes:
340/4.6, 340/313, 340/332
International Classes:
G08B5/36; G08B5/22
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US Patent References:
2980890Signaling systems
2042667Living diagram
1340145Indicating device
1327837Electrical indicator
0998391N/A
0841168N/A