Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/2831002
Is Reference of Apparecchio per retroproiezione-it#Sense
Ensemble rétro-projection-fr#Sense
Overhead projector-en#Sense
Overheadprojektor-da#Sense
Overheadprojectie-apparatuur-nl#Sense
Anlage fuer Overheadprojektion-de#Sense