Monitoring apparatus and method for electrical protection system

Details Monitoring apparatus and method for electrical protection system Monitoring apparatus and method for electrical protection system

1975-01-10

1976-01-20

Trafton, David L.

Communications: electrical

Systems

Call station

340409, G08B 1322

Patent

active

RE0286923

ABSTRACT:
1. Apparatus for increasing the security of an electrical protection system in which a protected location is conductively coupled to a central station which comprises at least two conductive means for coupling said protected location to said central station,

REFERENCES:
patent: 2249891 (1941-07-01), Ekman et al.
patent: 2895125 (1959-07-01), Watts
patent: 3133276 (1964-05-01), Miller et al.
patent: 3139143 (1964-06-01), Renda
patent: 3252156 (1966-05-01), Muehter
patent: 3254334 (1966-05-01), Mitchell

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