19 Articles of natural stone for building purposes, namely, paving stone; blocks made from natural stone; building elements of stone, namely, wall stone; building materials made from rock fibres, namely, rock crystal; building materials of mineral fibres, namely, mineral pellets for use in the building industry; building materials in the nature of slates for tiling, namely, slates for roof cladding; building products of slate, namely, stone slates; building stone; cladding not of metal, for building; coloured stone materials for use in building, namely, natural stone slabs and tiles; concrete building elements, namely, concrete blocks and tiles; concrete building panels; capping stones for support posts; capping stones for wall panels; concrete paving stones; construction materials of natural stone, namely, stone tiles, terra-cotta tiles and porcelain tiles; curtain wall facings of natural stone; granite; interior wall cladding of non-metallic materials; internal wall cladding of non-metallic materials; limestone products for use in building, namely, limestone slabs and tiles; manufactured stone veneer; natural stone; natural stone for building purposes; natural stones, not precious; non-metallic building materials for flooring and floors, namely, veneers for floors; non-metallic building materials for covering of floors, namely, wood veneers or floorboards; non-metallic building materials for use in cladding, namely, slates for roof cladding; non-metallic cladding for facades; non-metallic cladding for walls; non-metallic panels for interior cladding on buildings; non-metallic panels for outer cladding on buildings; non-metallic tiles for building; panelling elements made of natural stones, namely, paving stones; paving stones; nonmetal building materials, namely, pebbles; porphyry; slates for wall cladding; sandstone for building; stone for building; stone for walls; stone slate tiles; stone tiles; stone veneer; terrazzo stone for use in construction; worked natural stone; bricks; blocks made of non-metallic materials for building purposes, namely, blocks made of concrete and natural stone