About: http://webisa.webdatacommons.org/273907070

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 internal liner 54 is formed from a relatively rigid material such as sheet metal or plastic, substantially (or appropriately) porous to allow for substantially free passage of gases therethrough during use.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com