Building materials and components, not of metal, namely, circular rings of reinforced concrete, sections of circular rings of reinforced concrete for lining tunnels of all kinds; tunnel lining segments; linings, non metallic, for building; building materials, namely, fire protection building elements, non-metallic, in the nature of circular rings of reinforced concrete, sections of circular rings of reinforced concrete for lining tunnels of all kinds, and tunnel lining segments; building mate...