Wireless detection and warning system

Details Wireless detection and warning system Wireless detection and warning system

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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