Rain Gutter Pipe System. Close Up on Brick House with Roof Tiles and Plastic Roof Gutter Pipes Drain. Guttering Stock Photo - Image of wall, installing: 139244426
RAS | Rocktools
4 Functions of Pipe Roof Support of Tunnel Excavation - Sinorock
Ground and tunnel deformation induced by excavation in pipe-roof pre-construction tunnel: A case study - ScienceDirect