… Other tubes and pipes (for example, welded, riveted or similarly closed), having circular cross-sections, the …
Explanatory notes
… ‑ Other tubes and pipes (for example, welded, riveted or similarly closed), having circular cross-sections, the … tubular shapes can be produced : ‑ longitudinally or spirally in a continuous operation by means of a set of … or structural columns, as well as hydroelectric conduits, usually reinforced with rings. * * * The heading does not …