About: http://webisa.webdatacommons.org/61283391

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	The porous material such as urethane foam, steel wool and so on have been used as a filter for cleaning air.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com