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Subject Item
isa:14204228
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The system of claim 4 wherein said electronic circuit means further comprises means for adjusting the threshold sensitivity of the system to smoke and gas, said means including a sensitivity adjusting lamp and a switch connected to said lamp and said delay-off circuit means for controlling said sensitivity adjusting lamp during adjustment and for setting said delay-off circuit means. 7.
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isap:114553259
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isa:14204228