DIFF Subgroup
G03F 3/04 by photographic means
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Colour separation; Correction of tonal value > by photographic means
CPC:
Colour separation; Correction of tonal value (photographic copying apparatus in general G03B) > by photographic means
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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