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DIN ETS 300556
European digital cellular telecommunications system (phase 2) - Mobile radio interface signalling layer 3, general aspects; English version ETS 300556:1995
Edition
1995-08
DIN ETS 300335
Integrated Services Digital Network (ISDN) - Signalling system no. 7 - ISDN User Part (ISUP) version 1; Test specification; English version ETS 300335:1994
Edition
1995-01
