Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Patent-en#Sense
Carta patente-es#Sense
Offener Brief-de#Sense
Letters patent-en#Sense
Lettre patente-fr#Sense
Carta abierta-es#Sense
Patente-fr#Sense
Open brief-nl#Sense