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PCE
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DIFF Subgroup
G04B 19/32

by luminescent substances

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Indicating the time by visual means > Illumination of dials or hands > by luminescent substances

CPC:

Indicating the time by visual means ( by electric lamps G04C17/02; display arrangements in general G09F) > Illumination of dials or hands > by luminescent substances

No child classifications to compare. This is a leaf node in both IPC and CPC.