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Main page>DIN Standards>DIN ETS 300186 Integrated Services Digital Network (ISDN); Three-Party (3PTY) supplementary service; service description; English version ETS 300186:1993
in stockReleased: 1994-01
DIN ETS 300186
Integrated Services Digital Network (ISDN); Three-Party (3PTY) supplementary service; service description; English version ETS 300186:1993
