IPC Subgroup
G04C 21/16 producing the signals at adjustable fixed times
Introduced: September 1968
Last revised: January 2006
Full Title
Producing acoustic time signals by electrical means > producing the signals at adjustable fixed times
Classification Context
- Section:
- PHYSICS
- Class:
- HOROLOGY
- Subclass:
- ELECTROMECHANICAL CLOCKS OR WATCHES
7 direct subcodes
Child Classifications
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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 21/2 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 21/3 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 time-pieces
- G04C 21/36 Signal-repeating devices
- G04C 21/38 Adjusting the duration of signals