19 Asphalt, pitch, bitumen, tar; sand, gravel, mosaics for building, aquarium gravel; lime, cement, plaster; concrete, mortar, stone, artificial stone, marble; tile floorings not of metal, facings not of metal for building, coverings not of metal for building, wall linings not of metal for building, wall tiles not of metal for building, tiles not of metal for building; surfacings not of metal for building, coverings not of metal for buildings; tarred strips for building, coal tar, roofing slates