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200 BCE
Water Powered Escapement Mechanism Clock
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Feb 1, 900
Mercury Powered Escapement Mechanism Clock
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Feb 1, 1000
Water Clock using gears
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Jan 1, 1206
Candle Clock
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Feb 1, 1300
First Mechanical Clocks
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First Pocket Watches
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Pendulum Clock
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Quartz Oscillators Invented
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Atomic Clock
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Quartz Clocks Become Dominant