Recommendation U.12 (11/1988): Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)
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    value label: Recommendation U.11 (11/1988): Telex and gentex signalling on intercontinental circuits used for intercontinental automatic transit traffic (type C signalling)
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  entity created at: 2026-05-03T14:58:30.332496+00:00Z