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| More topics under "H04 - Electric communication technique" (4,467,530) |
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| H04B - Transmission (550,232) | | H04H - Broadcast communication (46,659) | | H04J - Multiplex communication (162,724) | | H04K - Secret communication; Jamming of communication (18,748) | | H04L - Transmission of digital information, e.g. telegraphic communication (1,213,129) | | H04M - Telephonic communication (384,297) | | H04N - Pictorial communication, e.g. television (985,724) | | H04Q - Selecting (115,455) | | H04R - Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers; Deaf-aid sets; Public address systems (142,186) | | H04S - Stereophonic systems (15,695) | | H04W - Wireless communication networks (832,681) |
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