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DIN ETS 300138-1:1998-02

Отменен
Integrated Services Digital Network (ISDN) - Closed User Group (CUG) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification; English version ETS 300138-1:1997
DIN ETS 300138-1:1998-02
Отменен