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Improvements in manufacturing such as the tooth-cutting machine devised by Robert Hooke allowed some increase in the volume of watch production, although finishing and assembling was still done by hand until well into the 19th century.A major cause of error in balance wheel timepieces, caused by changes in elasticity of the balance spring from temperature changes, was solved by the bimetallic temperature compensated balance wheel invented in 1765 by Pierre Le Roy and improved by Thomas Earnshaw.Time-related features such as timers, chronographs and alarm functions are common.Some modern designs incorporate calculators, GPS and Bluetooth technology or have heart-rate monitoring capabilities.In the 1960s the electronic quartz watch was invented, which was powered by a battery and kept time with a vibrating quartz crystal.By the 1980s the quartz watch had taken over most of the market from the mechanical watch.

It is designed to keep working despite the motions caused by the person's activities.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.Early models were essentially standard pocket-watches fitted to a leather strap but, by the early 20th century, manufacturers began producing purpose-built wristwatches.The Swiss company Dimier Frères & Cie patented a wristwatch design with the now standard wire lugs in 1903.

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