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Operational Bulletin No. 665 (1.IV.1998) and Annexed List: Various tones used in national networks (Supplement 2 to ITU-T Recommendation E.180) (Position on 1 April 1998)

Operational Bulletin No. 665 (1.IV.1998) and Annexed List: Various tones used in national networks (Supplement 2 to ITU-T Recommendation E.180) (Position on 1 April 1998)
01.04.1998

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