Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Passiv sikkerhed-da#Sense
Sécurité passive-fr#Sense
Sécurité secondaire-fr#Sense
Passive Sicherheit-de#Sense
Secondary safety-en#Sense
Δευτερεύουσα ασφάλεια; παθητική ασφάλεια-el#Sense
Passive security-en#Sense