NON-METALLIC BUILDING MATERIALS, NAMELY, NATURAL AND ARTIFICIAL STONE, CLINKER STONES FOR ABOVEGROUND AND UNDERGROUND CONSTRUCTION, LIMESTONE CHIPS, LIMESTONE SAND, GRAVEL, POWDER, AND LUMPS, ROAD CONSTRUCTION MATERIALS, NAMELY, GRAVEL, CHIPS, AND SAND, NATURAL STONE GRAVEL AND CHIPS, PAVING STONES; QUICKLIME, SLAKED LIME, MATERIALS FOR ROUGH-CASTING, IN PARTICULAR, BUILDING SURFACE CEMENTS, CEMENT, AND GYPSUM BASE WITH OR WITHOUT SYNTHETIC ADDITIVES" MORTAR AND CONCRETE; EQUALIZING BULK MATERIAL FOR FLOORS" NON-METALLIC BUILDING STRUCTURES, NON-METALLIC PORTABLE BUILDINGS, NON-METALLIC STRUCTURAL ELEMENTS, NAMELY, BEAMS, PLATES, PLANKS AND PANELS, BUILDING MATERIAL MADE ENTIRELY OR PREDOMINATELY OF FIBROUS MATERIAL, DRYWALLS, PLASTER BOARDS, BOARDS AND WALL MATERIAL MADE OF PLASTER AND FIBROUS MATERIAL