… (for example, welded, riveted or similarly closed), having circular cross-sections, the external diameter of which …
Explanatory notes
… (for example, welded, riveted or similarly closed), having circular cross-sections, the external diameter of which … for example, by welding or riveting preformed, unclosed, tubular shapes produced from flat‑rolled products. The tubular shapes can be produced : ‑ longitudinally or …