Security system

Details Security system Security system

1989-07-14

1992-04-07

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340531, 340539, 340533, 340508, 340507, 340536, G08B 2900

Patent

active

051032066

ABSTRACT:
A security system including a plurality of alarm equipped security units usable at discrete locations and operated by individual power sources at those discrete locations. The units are interconnected and alarm linked with one another with the system being set up such that disruption of the interconnection between units at any location in the system causes alarm operation at all of the alarm linked security units.

REFERENCES:
patent: 3133276 (1964-05-01), Miller et al.
patent: 3909826 (1975-09-01), Schildmeier et al.
patent: 4019139 (1977-04-01), Ortega
patent: 4660023 (1987-04-01), Thern et al.
patent: 4673920 (1987-06-01), Ferguson et al.
patent: 4812820 (1989-03-01), Chatwin

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