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PCE
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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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