Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Tromle-linse-da#Sense
Drum lens-en#Sense
Tambour dioptrique-fr#Sense
Óptica de tambor-es#Sense
Tambour-fr#Sense
Tambor dióptrico-es#Sense
Tamburo diottrico-it#Sense
Dioptric drum lens-en#Sense
Dioptrische Guertellinse-de#Sense
Dioptrische trommellens-nl#Sense
Διοπτρικός φακός ορίζοντος-el#Sense