About: http://webisa.webdatacommons.org/166227778

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	They only supply oxygen, so there is no requirement to control the gas mixture other than removing the carbon dioxide.[20]
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org