G - Physics – 08 – B
Patent
G - Physics
08
B
340/128
G08B 13/08 (2006.01) G08B 1/08 (2006.01) G08B 13/00 (2006.01) G08B 25/00 (2006.01)
Patent
CA 1141004
ALARM SYSTEM ACTIVATED BY BUZZERS Abstract In alarm systems a central control box has been activated by sensors at the entrances. The sensors signal the central control box through extensive wiring or by a radio transmitter at each entrance. In this invention the signalling is done by an inexpensive buzzer at each entrance providing one definite distinct sound to be identified. The central control box in this invention is sensitive to be activated by the buzzer of a distant entrance but it is not activated by ordinary sounds in an unoccupied house.
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