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AT&T continued using its microwave network for telephone service through this period, but Sprint's 1980s all-fiber, all-digital network forced the company to switch to digital as well, using new fiber rather than updating the microwave system. By the late 1990s, most of the microwave network had been turned off.
A thermal switch (sometimes thermal reset or thermal cutout (TCO)) is a device which normally opens at a high temperature (often with a faint "plink" sound) and re-closes when the temperature drops. The thermal switch may be a bimetallic strip, often encased in a tubular glass bulb to protect it from dust or short circuit. Another common design ...
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Microwave ovens operate by emitting electromagnetic waves, particularly microwaves, which interact with water molecules in the food. These microwaves cause the water molecules to oscillate rapidly ...
Seismic glass-break detectors feel these shock frequencies and in turn generate an alarm condition. Window foil is a less advanced detection method that involves gluing a thin strip of conducting foil on the inside of the glass and putting low-power electric current through it. Breaking the glass will tear the foil and break the circuit.
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