Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04N
PICTORIAL COMMUNICATION, e.g. TELEVISION
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H04N7/16
Analogue secrecy systems; Analogue subscription systems
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H04N7/173
with two-way working, e.g. subscriber sending a programme selection signal
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H04N7/17309
Transmission or handling of upstream communications
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H04N7/17327
with deferred transmission or handling of upstream communications
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