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Theft preventer alarm Click here for Circuit Diagram. This circuit utilising a 555 timer IC can be used as an alarm system to prevent the theft of your luggage, burglars breaking into your house etc. The alarms goes ON when a thin wire, usually as thin as a hair is broken. The circuit is straightforward. It uses a 555 IC wired as an astable multivibrator to produce a tone of frequency of about 1kHz which gives out a shrill noise to scare away the burglar. The wire used to set off the alarm can b...
Worldwide applications ; 1989-04-10 · Priority claimed from US07/335,381 ; 1991-07-19 · Priority claimed from US07/733,203 ; 1993-04-20 · Application filed by Back Flo Alarm Valve Co Inc ; 1993-04-20 · Priority to US08/058,431
1019 CAR ALARM SYSTEM ; "GN7C" installation manual.pdf ; 2nd generation car security system.PDF ; The Design of Mobile Control Car Security System ; Theft preventer alarm Click here for Circuit Diagram. This circuit ... ; COMMANDO MODEL ALA550 REMOTE CONTROL AUTO ALARM ...
An alarm valve and a backflow preventer are provided by a check valve and an alarm valve with a passageway provided between the check valve and the alarm valve preferably having a relief valve whic...
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Description ; 1. Field of Invention · This invention relates to testable potable water backflow prevention assemblies and the risk of contamination to a potable water supply they pose by virtue of the differential pressure gradient inherent to these devices and the ease with which one may access the water along the differential pressure gradient. This invention prevents unauthorized access to the potable water supply along the differential pressure gradient of testable backflow prevention assemblies. 2. Description of the Prior Art ...
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