… welded, riveted or similarly closed), having circular cross-sections, the external diameter of which exceeds 406.4 mm, …
Explanatory notes
… welded, riveted or similarly closed), having circular cross-sections, the external diameter of which exceeds 406.4 mm, … longitudinally or spirally in a continuous operation by means of a set of rollers, for flat‑rolled products in … or gas wells, tubes for long distance waterlines or slurry mains for coal or other solid materials, tubes for piling or …