Building surveillance apparatus

Details Building surveillance apparatus Building surveillance apparatus

1984-08-20

1986-04-01

Brady, W. J.

179 5R, H04M 1100

Patent

active

045800103

ABSTRACT:
A surveillance apparatus for the detection and prevention of damages due to fires, gas, robbery and other destructive conditions of a building which has a large number of rooms each furnished with a telephone set and a door provided with a lock. The telephone cables extending between respective rooms and a main terminal board of the building are utilized as wires for transmitting detection signals of detectors provided in respective rooms to indicators provided in a central surveillance room during the locking of the door.

REFERENCES:
patent: 3969584 (1976-07-01), Miller et al.
patent: 4249036 (1981-02-01), Kutzki

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