19 Building materials, not of metal in the nature of building stones; natural and artificial stone; bricks; flagstones; tiles not of metal for floors, walls, ceilings, roofing, and for building; tiles and paving slabs not of metal; cement; lime, namely, slag lime cement, lime building materials; mortar for building; gypsum for use as building materials and gravel; pipes of sandstone and of cement; road building materials in the nature of cement mixes, asphalt, pitch, bitumen, glass granules for road marking, concrete road pavement boards, crash barriers of concrete for roads, gravel for making road sub-surfaces; asphalt; pitch and bitumen; non-metallic transportable buildings; monuments of stone; non-metal chimneys; semi-finished wood; construction timber; beams not of metal; shafts, namely, chimney shafts not of metal; building panels not of metal; wood battens as building materials; compound wood boards, multi-layered wood, glue-laminated wood; glass for building; glass panes; glass tiles; construction products, namely, asphalt roof coatings, fireproof cement coatings; cement mixes for laying tiles, for floors and for coverings in general