Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Gegenstrahlleuchte-de#Sense
Obstakelverlichting-nl#Sense
Luce singola controluce-it#Sense
Appareil d'éclairage de compensation-fr#Sense
Tunnellampe-da#Sense
Counterbeam light-en#Sense