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A quartz clock is a clock that functions by means of an electronic oscillator regulated by a quartz crystal to keep time. Quartz clock clocks are preferred over mechanical clocks because they are about an order of magnitude more accurate. This is due to the unique quality of the the quartz crystal oscillator that makes it to create a signal with very precise frequency. Warren Marrison and J.W. Horton of Bell Telephone Laboratories are known to be the first to build a quartz clock.
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