| http://www.w3.org/ns/prov#value | - In a burglar alarm system of claim 2, said sensing circuit including a voltage comparator means having a pair of input terminals; said sensing circuit further including a series network of a fifth resistor and a third capacitor connected from the anode of the first-recited controlled rectifier to the negative terminal of the power supply means and one of said pair of input terminals of said compar
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