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DIN ETS 300139 Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; service description; english version ETS 300139:1992 skladem Datum vydání: 1992-12
DIN ETS 300139 Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; service description; english version ETS 300139:1992 ISDN; Dienstmerkmal Halten; Dienstbeschreibung; Englische Fassung ETS 300139:1992
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Status: Norma Datum vydání: 1992-12 Jazyk: Anglicky Označení: DIN ETS 300139 Název produktu: Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; service description; english version ETS 300139:1992 Počet stran: 18
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DIN ETS 300139
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