Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/36
Is Reference of Boog-aslijn-nl#Sense
Bogenachse-de#Sense
Curva direttrice di un arco-it#Sense
Båglinje-sv#Sense
Courbe directrice d'un arc-fr#Sense
Directriz del arco-es#Sense
Bueakse-da#Sense
Arch axis-en#Sense
Άξονας τόξου-el#Sense