Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Gallersystem-sv#Sense
Rechtecksystem-de#Sense
Système en forme de gril-fr#Sense
Rechthoekig systeem-nl#Sense
Sistema em forma de grade-pt#Sense
Εσχαρωτόν δίκτυον-el#Sense
Sistema en forma de parrilla-es#Sense
Gridiron system-en#Sense