7308: Structures & part of i/ nes; plates, rods, angle etc, for structures,

730810: Bridges and bridge sections, iron or steel 730820: Towers and lattice masts, iron or steel 730830: Doors, windows & their frames & thresholds for doors of iron or steel 730840: Props & similar equipment for scaffolding, shutterg/pit-propping, i/s 730890: Structures & parts of structures, i/s (ex prefab bldgs of headg no.94 7308: Structures & part of i/ nes; plates, rods, angle etc, for structures,