Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1979-06-22
1981-03-24
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
With particular system function
340517, 340533, 179 5R, G08B 2500
Patent
active
042583578
ABSTRACT:
The invention consists of applying a signalling condition to a telephone subscriber line to prime a common burglar alarm arrangement provided at the telephone exchange, which arrangement is activated by the removal of the signalling condition from the line by, for example, a burglary detection device. The equipment at the telephone exchange automatically identifies the subscriber line when the signalling condition is removed and activates an event recording alarm equipment in a Police or Security central station, giving a print out of the identity of the subscriber whose premises have been entered. The major advantage of the system is that the cutting of the telephone line causes the tripping of the common alarm equipment.
REFERENCES:
patent: 3648268 (1972-03-01), Paull
patent: 3925763 (1975-12-01), Wadhwani et al.
patent: 4044351 (1977-08-01), Everson
patent: 4118700 (1978-10-01), Lenihan
Plessey Handel und Investments AG
Waring Alvin H.
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