19 Telephone booths, not of metal; arbors used as structures, not of metal; roofing, not of metal, incorporating photovoltaic cells; fair huts, namely, huts being non-metal structures for mounting solar panels; building materials, not of metal, namely, rock crystal for use as building materials; tiles, not of metal, for building; flashing, not of metal, for building; roofing tiles, not of metal; refractory construction materials, not of metal; roof coverings, not of metal; building glass; pantiles, not of metal; transportable buildings, not of metal; wall tiles, not of metal; wall claddings, not of metal, for building; roofing slates; building timber; tile floorings, not of metal; nonmetallic transportable buildings; concrete building elements, namely, concrete building blocks; pilings, not of metal, namely, pilings of wood; non-metallic roof panel composed of solar cells, namely, roofing, not of metal, incorporating solar cells; glassbricks