DIFF Subgroup
G04B 19/30 Illumination of dials or hands
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Indicating the time by visual means > Illumination of dials or hands
CPC:
Indicating the time by visual means ( by electric lamps G04C17/02; display arrangements in general G09F) > Illumination of dials or hands
Of 2 combined children, 1 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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