DIFF Main Group
G04G 13/00 Producing acoustic time signals
Introduced: January 1980
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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- G04G 13/02 at preselected times, e.g. alarm clocks since 1980 +4 CPC IPC+CPC Available in IPC and CPC