Citizens alarm system

Details Citizens alarm system Citizens alarm system

1975-01-09

1977-08-02

Yusko, Donald J.

Communications: electrical

Digital comparator systems

179 3, 179 5R, 340298, 340416, G08B 2500, H04Q 900, H04M 1106

Patent

active

040400131

ABSTRACT:
A combined police and fire alarm system has provision for voice communication between street corner boxes and a central station via existing telegraphic cables. The boxes automatically transmit identification signals to the central station upon being activated. The central station can check out the boxes by causing them to transmit their identification signals and an audio test signal.

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patent: 3307176 (1967-02-01), Sadler
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patent: 3673329 (1972-06-01), Weld
patent: 3678512 (1972-07-01), Fergus
patent: 3725865 (1973-04-01), Fairchild
patent: 3754215 (1973-08-01), Blomenkamp
patent: 3815112 (1974-06-01), Kleber
patent: 3842208 (1974-10-01), Paraskevakos

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