7308: Structures, parts of structures of iron or steel, nes

730810: Bridges and bridge sections, iron or steel 730820: Towers and lattice masts, iron or steel 730830: Doors, windows, frames of iron or steel 730840: Props etc for scaffold, shuttering, pits, iron/steel 730890: Structures and parts of structures, iron or steel, ne 7308: Structures, parts of structures of iron or steel, nes