19 Concrete, clay roofing tiles, natural stones, artificial stones, building materials, namely, semi-worked woods, building materials in shaped forms made of wood, prefabricated building materials made of wood being, namely, wooden window frames, window frames of wood, wood door frames; window shutters of wood, wood jalousie profiles, wood panelling, vendor booths made of wood, parquet flooring made of wood, wood boards, floor tiles of wood, semi-worked wood, wood posts, wood beams, plastic tiles; flooring or wall-claddings of synthetic materials; natural marble, artificial marble, inner and outer facings of natural or artificial stones; concrete panels, concrete pipes, concrete beams, concrete blocks, concrete bollards, concrete walls, concrete fences, concrete roof repair compounds, concrete slabs, concrete roof tiles, barrier of concrete, concrete poles for electric power lines; plaster for building purpose, namely, plaster boards, plaster panels, plaster walls, plasters for prefabricated buildings; bricks, non-metallic rigid pipes for building, non-metallic transportable buildings