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
(Yellow book : VIIth Plenary Assembly, Geneva, 10-21 November 1980 / CCITT, The International Telegraph and Telephone Consultative Committee, vol. 6 ; fasc. 6-4)
International Telecommunication Union, 1981
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