About: http://webisa.webdatacommons.org/272537951

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	Those silver boxes had a fancy name I can???t recall, but they monitored various gasses such as oxygen, explosives, carbon monoxide and other chemicals.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com