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ITU-T Q.263 1988 Edition, November 1, 1988
Complete Document
Superseded By: ITU-T Q.251-Q.300
4.3 Double Seizing with Both-Way Operation - Specifications of Signalling System No. 6 (Study Group XI) 2 pp
Additional Comments: W/D S/S BY ITU-T Q.251-Q.300
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