DIFF Subgroup
G04C 21/30 with provision for a number of operations at different times, e.g. ringing the bells in a school
Introduced: September 1968
Full Title
Producing acoustic time signals by electrical means > producing the signals at adjustable fixed times > with provision for a number of operations at different times, e.g. ringing the bells in a school
Of 2 combined children, 1 exist in both systems.
1 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- G04C 21/32 giving indications at a number of places each at a different time, e.g. system of alarms in a hotel +2 CPC IPC+CPC Available in IPC and CPC