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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 300007
Integrated Services Digital Network (ISDN); support of packet-mode terminal equipment by an ISDN; english version ETS 300007:1991
Edition
1992-11