Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Balklep-nl#Sense
Clapet à bille-fr#Sense
Kogelklep-nl#Sense
Ball valve-en#Sense
Spherical valve-en#Sense
Kogelventiel-nl#Sense
Globe valve-en#Sense
Kugelventil-de#Sense
Soupape à bille-fr#Sense