Telegraph transmission : recommendations of the R series. Telegraph services terminal equipment : recommendations of the S series
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Telegraph transmission : recommendations of the R series. Telegraph services terminal equipment : recommendations of the S series
（Red book : VIIIth Plenary Assembly, Malaga-Torremolinos, 8-19 October 1984 / CCITT, the International Telegraph and Telephone Consultative Committee, vol. 7 ; fasc. 7-1）
International Telecommunication Union, 1985
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