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A grandfather clock (also a longcase clock, tall-case clock, grandfather's clock, hall clock or floor clock) is a tall, freestanding, weight-driven pendulum clock, with the pendulum held inside the tower or waist of the case. Clocks of this style are commonly 1.8-2.4 metres (6-8 feet) tall with an enclosed pendulum and weights, suspended by either cables or chains, that have to be occasionally calibrated to keep the proper

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