Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Válvula principal-pt#Sense
Hoofdafsluiter-nl#Sense
Hauptschieber-de#Sense
Hovedventil-da#Sense
Saracinesca principale-it#Sense
Master gate-en#Sense
Vanne-maîtresse-fr#Sense
Válvula maestra-es#Sense
Κύρια δικλείδα-el#Sense