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NON-METALLIC BUILDING MATERIALS-NAMELY, SURFACE LEVELLING AND FINISHING GROUT, BUILDING BOARDS, PREFABRICATED BUILDING PARTS CONSISTING OF WOOD OR OTHER LIGHTWEIGHT CORES COVERED WITH BUILDING BOARDS OR SHEETS; ROOG TILES AND ROOF SHEETS; CEILING BOARDS, CONCRETE ELEMENTS, SHEETS FOR INTERIOR AND EXTERIOR FURNISHING, CERAMIC TILES, JOINTING COMPOUNDS, CONCRETE [ AND ASBESTOS CEMENT ] PIPES, BUILDING BASIC MATERIALS-NAMELY, CEMENT, BRICKS, COMPACTING COMPOSITIONS, [ ASBESTOS, ] LIME, MINE SLACK, SAND, SHINGLES, STONE, GYPSUM AND MORTAR; PREFABRICATED, MOV Dismounted Houses and Precast Concrete ONCRETE AND PREFABRICATED BUILDING ELEMENTS BASED ON OTHER MINERAL MATERIALS