Watches

Watches progressed in the 17th century from spring-powered clocks, which appeared as early as the 14th century. During most of its history, the watch was a mechanical device, driven by clockwork, powered by winding a mainspring, and keeping time with an oscillating balance wheel. In the 1960s the electronic quartz watch was invented, which was powered by a battery and kept time with a vibrating quartz crystal.
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