Building materials, natural and artificial stone, cement, lime mortar, plaster and gravel; pipes of earthenware or cement; road-making materials; asphalt, pitch and bitumen; portable buildings; stone monuments; chimney pots,

Building materials (non-metallic), including precast concrete panels; non-metallic rigid pipes for building; asphalt, pitch and bitumen; non-metallic transportable buildings; monuments, not of metal