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Edition 2014-12-03

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Edition 2011-11-02

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Edition 2022-09-29

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Edition 2024-06-21

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Edition 2022-12-09

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Edition 2022-06-29

European digital cellular telecommunications system (Phase 2) - Call Waiting (CW) and Call Hold (HOLD) supplementary services - Stage 2; English version ETS 300544:1995
Edition 1995-09

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Edition 2016-06-29

Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; service description; english version ETS 300139:1992
Edition 1992-12

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Edition 1992-12