19 Building and construction materials and elements, not of metal, namely, semi-worked woods; Shelter structures and transportable buildings, not of metal; Building and construction materials and elements, namely, pitch, tar, bitumen or asphalt; Building and construction materials and elements, namely, sand, natural stone, clay slabs, non-metallic minerals and concrete; Stone, clay slabs and non-metallic minerals for building or construction; Spackling compound; Building and construction materials and elements, namely, rock materials used in building flooring, roofing, countertops, walls, cladding and fireplaces