Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Air gap-en#Sense
Intraferro-it#Sense
Traferro-it#Sense
Luftspalt-de#Sense
Luftgab-da#Sense
Luchtspleet-nl#Sense
Entrefer-fr#Sense