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guscbe25

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guscbe25

Burglar Alarm working

How a burglar alarm works? Simple expalanation requested
16:55 Sun 02nd Aug 20096 answers, last by buildersmate 09:37 Mon 03rd Aug 2009
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guscbe25

optical burglar alarm

what is the working and explanation for optical burglar alarm with timer
16:36 Sun 02nd Aug 20091 answer, last by ACtheTROLL 17:40 Sun 02nd Aug 2009

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