CPC Subgroup
H04N 7/173 with two-way working, e.g. subscriber sending a programme selection signal
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) > Analogue secrecy systems; Analogue subscription systems > with two-way working, e.g. subscriber sending a programme selection signal
5 direct subcodes
Child Classifications
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