Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Haupteinflugzeichen-de#Sense
ILS-keskimerkki-fi#Sense
Radiofaro verticale intermedio-it#Sense
Mittelmarker-de#Sense
Middle marker beacon-en#Sense
Mellanmarkeringsfyr-sv#Sense
Radiofaro marcador intermedio-es#Sense
Radioborne intermédiaire-fr#Sense
Mellemste markerfyr-da#Sense
Radiofarol intermédio-pt#Sense
Middenmerkbaken-nl#Sense