19 NON-METALLIC BUILDING MATERIALS; FLOORINGS AND LININGS MADE OF MARBLE, GRANITE, GRANITE GRIT, GLASS GRIT AND MIXTURE THEREOF; TILES OF GRANITE GRIT AND GLASS GRIT; PLATES AND SLABS OF GRANITE GRIT AND GLASS GRIT; MARBLE SLABS AND PLATES; BUILDING MOSAICS OF CERAMICS, GLASS-CERAMIC, GRANITE AND GLASS