Apparatus for supervising leads interconnecting a plurality of s

Details Apparatus for supervising leads interconnecting a plurality of s Apparatus for supervising leads interconnecting a plurality of s

1976-06-24

1977-04-12

Waring, Alvin H.

Communications: electrical

Audible indication

Pneumatic-type sound producer

340253B, G08B 1700

Patent

active

040178528

ABSTRACT:
Circuitry associated with a self-contained abnormal condition sensing and alarm annunciating unit for supervising or monitoring leads interconnecting a plurality of such units and for responding to an open circuit condition of such leads so as to actuate an annunciator in a distinctive fashion to signal the open circuit condition.

REFERENCES:
patent: 3711854 (1973-01-01), Reynolds et al.

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