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ITU-T R.40 Coexistence in the same cable of telephony and super-telephony telegraphy
ITU-T U.6 Prevention of fraudulent transit traffic in the fully automatic international telex service
ITU-T N.52 Multiple destination television transmissions and coordination centres
ITU-T G.738 Characteristics of primary PCM multiplex equipment operating at 2048 kbit/s and offering synchronous digital access at 320 kbit/s and/or 64 kbit/s
ITU-T O.132 Quantizing distortion measuring equipment using a sinusoidal test signal
ITU-T L.8 Corrosion caused by alternating current
ITU-T Q.102 Facilities provided in international automatic working
ITU-T R.83 Changes of level and interruptions in VFT channels
ITU-T R.49 Interband telegraphy over open-wire 3-channel carrier systems
ITU-T H.110 Hypothetical reference connections for videoconferencing using primary digital group transmission
ITU-T U.21 Operator recall on a telex call set up on a radiotelegraph circuit