地下通信 meaning in English

underground communication

Pvc - u unplasticized polyvinyl chloride multi - hole pipe for buried telecommunication conduit
地下通信管道用硬聚氯乙烯
Code for construction and acceptance of buried telecommunication plastic conduit engineering in city area
城市地下通信塑料管道工程施工及验收规范
Plastics . unplasticized polyvinyl chloride pipes for underground communication lines . specifications
塑料制品.地下通信线路用非增塑聚氯乙烯管件.规范