Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Nodulair ruwijzer-nl#Sense
Ghisa sferoidale-it#Sense
Fonte à graphite sphéroidal-fr#Sense
Kugelgraphitguss-de#Sense
Κονδυλώδης χυτοσίδηρος-el#Sense
Nodular cast iron-en#Sense