DIFF Subgroup
G04C 21/16 producing the signals at adjustable fixed times
Introduced: September 1968
Full Title
Producing acoustic time signals by electrical means > producing the signals at adjustable fixed times
IPC and CPC are identically structured here. All 7 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
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 +1 CPC IPC+CPC Available in IPC and CPC
- G04C 21/20 by closing a contact to ring an electromechanical alarm +1 CPC IPC+CPC Available in IPC and CPC
- G04C 21/28 by closing a contact to put into action electro-acoustic means, e.g. awakening by music IPC+CPC Available in IPC and CPC
- G04C 21/30 with provision for a number of operations at different times, e.g. ringing the bells in a school +1 CPC IPC+CPC Available in IPC and CPC