DIFF Main Group
G04C 17/00 Indicating the time optically by electric means (G04C19/00 takes precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Indicating the time optically by electric means
CPC: Indicating the time optically by electric means (G04C19/00 takes precedence)
Full Title
Full titles differ between systems:
IPC:
Indicating the time optically by electric means
CPC:
Indicating the time optically by electric means (G04C19/00 takes precedence)
CPC subdivides this area 7x more granularly than IPC with 6 additional codes.
6 codes are CPC-only extensions.
Child Classifications
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