Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Pintakovuus-fi#Sense
Oberflächenverhärtung-de#Sense
Resistenza superficiale alla penetrazione-it#Sense
Ythärdning-sv#Sense
Resistencia a la impregnación-es#Sense
Overfladehærdning-da#Sense
Impénétrabilité superficielle-fr#Sense
Impenetrabilidade superficial-pt#Sense
Surface hardening-en#Sense