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ITU-T G Supplement 34 III.5 Temperature in underground containers for the installation of repeaters
ITU-T Q.296 Monitoring and maintenance of the common signalling channel
ITU-T N Supplement 6.1 IV.3 Effect on maintenance of the introduction of new components and of modern equipment design
ITU-T E.275 Transmission in encoded form of monthly international accounting information
ITU-T Q.457 Range, speed and reliability of interregister signalling; Range of interregister signalling