Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Plano focal de una luz-es#Sense
Plan focal d'un feu-fr#Sense
Εστιακό επίπεδο-el#Sense
Brennebene eines Leuchtfeuers-de#Sense
Piano focale di un fuoco-it#Sense
Focal plane of a light-en#Sense
Brændplan i et fyr-da#Sense
Focal plane-en#Sense