Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/2011
Is Reference of Copper and articles thereof, excluding copper alloys containing more than 10% by weight of nickel-en#Sense
Cuivre, à l'exclusion des alliages de cuivre contenant en poids plus de 10% de nickel-fr#Sense