Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1979-10-09
1981-07-14
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340545, G08B 2100
Patent
active
042789672
ABSTRACT:
A warning device having a sensing signal transmitting unit which includes a sensing element which operates when, for example, a door under observation is opened, and a receiving unit which produces a warning in response to the transmitted signal.
REFERENCES:
patent: 4101872 (1978-07-01), Pappas
patent: 4101873 (1978-07-01), Anderson et al.
patent: 4160246 (1979-07-01), Martin et al.
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