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Publication of BE688225ApublicationCriticalpatent/BE688225A/xx
H04B14/00—Transmission systems not characterised by the medium used for transmission
H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation