Room status indicating system
United States Patent 3228020
US Patent References:
/0841168.html
- - 0841168

/0998391.html
- - 0998391

Electrical indicator
- - 1327837

Indicating device
- - 1340145

Living diagram
- - 2042667


Inventors:
Irvin, Gassenheimer
Gassenheimer Jr., Irvin
Publication Date:
01/04/1966
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Assignee:
Irvin, Gassenheimer
Gassenheimer Jr., Irvin
Primary Class:
340/286.080
Other Classes:
340/825.280, 340/332, 340/313
International Classes:
G08B5/36; G08B5/22
US Patent References:
2980890Signaling systems