Specifications of signalling systems R1 and R2 : recommendations Q.310-Q.490
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Specifications of signalling systems R1 and R2 : recommendations Q.310-Q.490
(Red book : VIIIth Plenary Assembly, Malaga-Torremolinos, 8-19 October 1984 / CCITT, the International Telegraph and Telephone Consultative Committee, vol. 6 ; fasc. 6-4)
International Telecommunication Union, 1985
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