Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Ground point-en#Sense
Aardingspunt-nl#Sense
Punto di massa-it#Sense
Maadoituspiste-fi#Sense
Erdungspunkt-de#Sense
Punto de masa-es#Sense
Σημείο γείωσης-el#Sense
Ponto de massa-pt#Sense
Point de masse-fr#Sense
Masseanschlußpunkt-de#Sense