Mail box indicator
United States Patent 2968804
US Patent References:
/1167045.html
- - 1167045
/1256740.html
- - 1256740
Mail-box
- - 1342468
Apparatus for detecting fires in holds, etc.
- - 2118836
Apparatus for detecting and measuring heteroatomic gases
- - 2212211
/1167045.html
- - 1167045
/1256740.html
- - 1256740
Mail-box
- - 1342468
Apparatus for detecting fires in holds, etc.
- - 2118836
Apparatus for detecting and measuring heteroatomic gases
- - 2212211
Inventors:
Buffington, Raymond F.
Publication Date:
01/17/1961
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Export Citation:
Assignee:
Buffington, Raymond F.
Primary Class:
Other Classes:
250/222.100, 232/34, 473/67, 250/200
International Classes:
A47G29/122; A47G29/00
US Patent References:
| 2763853 | Supervised apparatus for detecting the presence of suspended matters in fluids |