DIFF Subgroup
H04N 7/14 Systems for two-way working ( H04N7/173 take precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Systems for two-way working
CPC: Systems for two-way working ( H04N7/173 take precedence)
Full Title
Full titles differ between systems:
IPC:
Television systems > Systems for two-way working
CPC:
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 2 combined children, 1 exist in both systems.
1 codes are CPC-only extensions.
IPC defines codes here since 1990.
Child Classifications
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