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History of timekeeping devices
Pendulum clock - Wikipedia ... Pendulum clock
A torsion pendulum clock, more commonly known as an anniversary clock or 400-day clock, is a mechanical clock which keeps time with a mechanism called a torsion pendulum. This is a weighted disk or wheel, often a decorative wheel with three or four chrome balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring (also ...
Clock - Wikipedia ... Clock
Hourglass - Wikipedia ... Hourglass
Watch glass - Wikipedia ... Watch glass
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