About: http://webisa.webdatacommons.org/274027719

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	Preferably, said gas is air. [0010] In one preferred form, the apparatus further includes a user control interface remote from said vessel for user control of said apparatus, including switch means for said apparatus.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com