… and parts of structures (for example, bridges and bridge-sections, lock-gates, towers, lattice masts, roofs, roofing … for doors, shutters, balustrades, pillars and columns), of iron or steel; plates, rods, angles, shapes, sections, tubes …
Explanatory notes
… and parts of structures (for example, bridges and bridge‑sections, lock‑gates, towers, lattice masts, roofs, roofing … for doors, shutters, balustrades, pillars and columns), of iron or steel; plates, rods, angles, shapes, sections, tubes … these structures are characterised by the fact that once they are put in position, they generally remain in that …