Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/6816002
Is Reference of Tubes ... straight and of uniform wall thickness, unworked, of circular cross-section, welded-en#Sense
Tubes ... droits et à paroi d'épaisseur uniforme, bruts, de section circulaire, soudés-fr#Sense