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L.257�:�Investigation of the soil before using trenchless techniques �

Recommendation L.257

In force components
Number
 Title Status
L.257 (05/00)
� 		Investigation of the soil before using trenchless techniques �
Former ITU-T L.39 renumbered as ITU-T L.257 on 2016-02-15 without further modification and without being republished. 		In force

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