Standardized Colour Test Charts No. 6 97
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Test chart No. 4 1994 - High Quality
Test Chart No. 4: Black and white facsimile test chart BW01 - (ITU-T Recommendation T.22) ((03/93))
Puesta a tierra de las instalaciones de
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Operational Bulletin No. 690 (15.IV.1999
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The Protection of Telecommunication Line
The Protection of Telecommunication Lines and Equipment Against Lightning Discharges - Chapters 1 to 5 (1974)
Operational Bulletin No. 691 (1.V.1999)
Operational Bulletin No. 691 (1.V.1999) and Annexed List: Service Restrictions (Recapitulatory list of service restrictions in force relating to telecommunications operation) (Position on 1 May 1999) (01.05.1999)
Operational Bulletin No. 665 (1.IV.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)
Operational Bulletin No. 733 (1.II.2001)
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Operational Bulletin No. 692 (15.V.1999)
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