Building materials, not of metal; Rails, Slabs, Perches, Lattice work; Frame parts; Flat and angular section rails and strips, and assembly profile pieces for coverings, mounts and transitions on wall and floor coverings and stair treads; All the aforesaid goods of plastic; Profiles for building construction (Non-metallic -); Mouldings, not of metal, for building; Street gutters, not of metal; Sluices [channels], not of metal; Drains [other than of metal or plastic]; Discharge pipes (Non-meta...