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- [4] UNITED KINGDOM PARTICIPATION IN THE FIELD TRIAL OF CCITT SIGNALLING SYSTEM NO. 6. 1974, 41 (11): : 133 - 136
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- [6] INTERNATIONAL FIELD TRIALS OF CCITT SIGNALLING SYSTEM NO. 6 IN WHICH JAPAN PARTICIPATED. 1974, 41 (11): : 126 - 129
- [7] CCITT SIGNALLING SYSTEM NO. 6 FIELD TRIAL UNITED STATES INSTALLATION. 1974, 41 (11): : 114 - 116
- [8] FIELD TRIAL OF CCITT SIGNALLING SYSTEM NO. 6 IN A NATIONAL TELEPHONE NETWORK. 1974, 41 (11): : 140 - 144
- [10] FIELD TRIALS OF CCITT SIGNALING SYSTEM NO 6 TELECOMMUNICATION JOURNAL, 1974, 41 (02): : 106 - 107