Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Fireclay-en#Sense
Argilla refrattaria-it#Sense
Feuerfester Ton-de#Sense
Πυρίμαχη άργιλος-el#Sense
Argile réfractaire-fr#Sense
Vuurvaste klei-nl#Sense