[ Non-metallic building materials, namely, semi-worked woods and plastic pipe supports; non-metallic rigid pipes for building; asphalt, pitch and bitumen; non-metallic transportable buildings; monuments, not of metal; cement mixes; concrete slabs; ] floors, not of metal; [ staircases, not of metal; spandrels, not of metal; railings, not of metal, for balconies; railings, not of metal, for bridges; blocks of cement; ]conglomerate marble; [ conglomerate cement; conglomerate marble and cement; b...