Subcategories
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Mechanical clock
A mechanical clock uses the movement of a spring or pendulum to keep a regular time. The pendulum design is the oldest design after solar and water clocks.
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Electronic precision...
The electronic precision clock is designed to keep very accurate time. There are two basic types, the atomic clock (not in my collection) and the clock as a function of a navigation system where the computation of position is 4D (it includes an accurate time relative to the base system, for example GPS)
