About: http://webisa.webdatacommons.org/6582638

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	In this manner, clean, filtered gas is supplied within the vacuum passages during those critical periods where smoke and other contaminants would otherwise be free to enter those passages.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es