DIFF Main Group
G04B 21/00 Indicating the time by acoustic means (at preselected times G04B23/00; by electro-acoustic means G04C21/04; )
Introduced: September 1968
Title
Titles differ between systems:
IPC: Indicating the time by acoustic means
CPC: Indicating the time by acoustic means (at preselected times G04B23/00; by electro-acoustic means G04C21/04; )
Full Title
Full titles differ between systems:
IPC:
Indicating the time by acoustic means
CPC:
Indicating the time by acoustic means (at preselected times G04B23/00; by electro-acoustic means G04C21/04; )
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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- G04B 21/02 Regular striking mechanisms giving the full hour, half hour or quarter hour +2 CPC IPC+CPC Available in IPC and CPC