Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1993-06-24
1996-05-14
Swarthout, Brent A.
Communications: electrical
Condition responsive indicating system
With particular system function
340506, 34087021, 340510, 364138, 364185, G08B 2908
Patent
active
055171753
ABSTRACT:
A warning or alarm sensor supervision circuit employs varying voltage levels which may vary at random intervals and to random levels.
REFERENCES:
patent: 4287515 (1981-09-01), Raber et al.
patent: 4567471 (1986-01-01), Acar
patent: 5084696 (1992-01-01), Guscott et al.
patent: 5155468 (1992-10-01), Stanley et al.
Brown Glenn A.
Weinhold Robert B.
Stellar Security Products, Inc.
Swarthout Brent A.
Wu Daniel J.
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