19 Building and construction materials; building materials made of rock fibres; mineral pellets for use in the building industry; minerals for use in construction; stone, rock, clay and minerals; non-metallic minerals for building or construction; building and construction materials and elements made of sand, stone, rock, clay, minerals and concrete; concrete; cement; aggregates; aggregate materials for use in concrete; aggregates for use in the preparation of concrete; paving stones; paving tiles; wood paving; structures (non-metallic) for paving of surfaces; gravel; coarse gravel; polymer concrete; polymeric bitumen emulsions for road surfaces; floors, not of metal; ceramic articles for construction purposes; prefabricated non-metal buildings; prefabricated building components (non-metallic -)