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G04C21/00—Producing acoustic time signals by electrical means
G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
G04C21/18—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times by mechanically unlocking an electromechanical vibrator, e.g. actuated by the leakage flux of the electric driving means
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Physics & Mathematics
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General Physics & Mathematics
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Electromechanical Clocks
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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
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