19 WALLING AND BUILDING BLOCKS; PAVING; PAVING SLABS AND BLOCKS; EDGING ELEMENTS AND EDGING CORNER UNITS FOR PAVING, PATHS, DRIVEWAYS AND FLOWER BORDERS AND BEDS; ORNAMENTAL PLANTERS AND GARDEN POTS; QUOINS; KEYSTONES; ARCHITECTURAL DRESSINGS, NAMELY WINDOW SURROUND ELEMENTS; ROOFING TILES AND SLATES; MORTAR