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DIN ETS 300336
Integrated Services Digital Network (ISDN) - Signalling system No. 7; Message Transfer Part (MTP) - Testspecification; English version ETS 300336:1996
Edition
1997-07
DIN ETS 300546
European digital cellular telecommunications system (Phase 2) - Closed User Group (CUG) supplementary services - Stage 2; English version ETS 300546:1996
Edition
1996-08