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ITU-T L.11 (11/1988) عربي | 中文 | English | Español | Français | Русский Joint use of tunnels by pipelines and telecommunication cables, and the standardization of underground duct plans Approval date: 1988-11-25 Approval process: WTSA Status: In force Maintenance responsibility: ITU-T Study Group 15 Further detail(s): Patent statement(s) Editions Ed. ITU-T Recommendation Status Summary Table of Contents Download 1 L.11 (11/1988) In force - - here