DIFF Subgroup
H04N 7/141 Full Title
Television systems (details H04N3/00, H04N5/00; methods or arrangements, for coding, decoding, compressing or decompressing digital video signals H04N19/00; selective content distribution H04N21/00) > Systems for two-way working ( H04N7/173 take precedence)
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.