19 Artificial stone; building stone; non metallic tiles of ceramic, clay, glass, cement, resins for construction purpose, gypsum or earthenware; mosaics for building of ceramic, cement, resins for construction purpose, glass; non metallic tile planks of ceramic, clay, glass, cement, resins for construction purpose, gypsum or earthenware; non metallic claddings for building; non metallic raised floor; non metal wall and floor tiles for building; non metallic floor and wall slabs of ceramic, clay, glass, cement, resins for construction purpose, gypsum or earthenware; non metallic floor blocks of ceramic, cement, resins for construction purpose and concrete; non metallic grates and non metallic grating support system for bathtub and swimming pool area; non metallic floor and wall panels; non metallic building panels; non metallic swimming pools; non metallic building material, namely, angle irons not of metal; manhole covers, not of metal; gutter pipes, not of metal; water-pipes, not of metal; water-pipe valves, not of metal or plastic; penstock pipes, not of metal; gratings, not of metal; diving boards, not of metal