available with a take-up roller that stored the printed output under a locked
The IBM 801, 802, and 803 line of check proofers used what were fundamentally
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Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
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