… structures (for example, bridges and bridge-sections, lock-gates, towers, lattice masts, roofs, roofing frame-works, … and windows and their frames and thresholds for doors, shutters, balustrades, pillars and columns), of iron or steel; plates, rods, angles, shapes, sections, tubes and the …
Explanatory notes
… structures (for example, bridges and bridge‑sections, lock‑gates, towers, lattice masts, roofs, roofing frame‑works, … and windows and their frames and thresholds for doors, shutters, balustrades, pillars and columns), of iron or … as : Pit head frames and superstructures; adjustable or telescopic props, tubular props, extensible coffering beams, …