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G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
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Physics & Mathematics
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General Physics & Mathematics
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Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers
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