DIFF Subgroup
H04N 1/4076 Full Title
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof > Picture signal circuits (H04N1/387 takes precedence) > Control or modification of tonal gradation or of extreme levels, e.g. background level
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.