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ITU-T G Supplement 7 Loss-frequency response of channel-translating equipment used in some countries for international circuits
ITU-T G Supplement 8 Method proposed by the Belgian telephone administration for interconnection between coaxial and symmetric pair systems
ITU-R F.338-2 Bandwidth required at the output of a telegraph or telephone receiver
ITU-R BS.467-0 Technical characteristics to be checked for frequency-modulation stereophonic broadcasting