producing the signals at adjustable fixed times

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Producing acoustic time signals by electrical means > producing the signals at adjustable fixed times

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• G04C 21/18 by mechanically unlocking an electromechanical vibrator, e.g. actuated by the leakage flux of the electric driving means
• G04C 21/20 by closing a contact to ring an electromechanical alarm
• G04C 21/28 by closing a contact to put into action electro-acoustic means, e.g. awakening by music
• G04C 21/30 with provision for a number of operations at different times, e.g. ringing the bells in a school
• G04C 21/34 Devices on watches or similar portable timepieces
• G04C 21/36 Signal repeating devices
• G04C 21/38 Adjusting the duration of signals