Fault indicating apparatus
United States Patent 2672601
US Patent References:
/0561431.html
- - 0561431

/0687948.html
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- - 1914481

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Inventors:
Guy, Welby Brian
Publication Date:
03/16/1954
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Assignee:
FERRANT LTD
Primary Class:
340/679
Other Classes:
178/23A, 714/811, 714/798, 340/686.100
International Classes:
G06K5/02; G06K5/00
US Patent References:
2369678Electrical remote control or supervisory system
2389204Alarm signal system for automatic valves