Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Float chamber-en#Sense
Pozo del flotador-es#Sense
Schwimmerschacht-de#Sense
Poço do flutuador-pt#Sense
Pozzo del galleggiante-it#Sense
Puits du flotteur-fr#Sense