Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Marche di bordo libero-it#Sense
Marques de franc bord-fr#Sense
Freibordmarke-de#Sense
Fribordsmærker-da#Sense
Freeboard marks-en#Sense
Uitwateringsmerk-nl#Sense