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Several important watch inventions - George Graham invented mercurial compensation pendulum and dead-beat escapement for clocks, John Harrison invented grid-iron compensation pendulum and George Graham invented the cylinder escapement. (jan 1, 1720 – jan 1, 1750)

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Maths - History of time

ByCharlotte Best
21 Nov 2019
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Date:

jan 1, 1720
jan 1, 1750
~ 30 years
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