Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/6826
Is Reference of Service périodique-fr#Sense
Servicio periódico-es#Sense
Periodic duty-en#Sense
Periodisk drift-sv#Sense
Periodiek bedrijf-nl#Sense
Periodischer Betrieb-de#Sense
Funzionamento periodico-it#Sense
Periodisk drift-da#Sense
Jaksoittaiskäyttö-fi#Sense
Serviço periódico-pt#Sense