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DIN ETS 300502
European digital cellular telecommunications system (Phase 2) - Teleservices supported by a GSM Public Land Mobile Network (PLMN); English version ETS 300502:1994
Edition
1995-03
DIN ETS 300080
Integrated Services Digital Network (ISDN); ISDN lower layer protocols for telematic terminals; English version ETS 300080:1992
Edition
1993-09