Precast concrete pipes, fittings and ancillary products, Specification for unreinforced and reinforced pipes and fittings with flexible joints— 44 стр.
Precast concrete pipes, fittings and ancillary products, Specification for unreinforced and reinforced manholes and soakaways of circular cross section
Precast concrete pipes, fittings and ancillary products, Specification for unreinforced and reinforced pipes and fittings with flexible joints— 44 стр.
Precast concrete pipes, fittings and ancillary products, Specification for unreinforced and reinforced manholes and soakaways of circular cross section
