DIFF Main Group
G04C 21/00 Producing acoustic time signals by electrical means
Introduced: September 1968
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- G04C 21/02 Constructional details (G04C21/04, G04C21/16 take precedence) IPC+CPC Available in IPC and CPC