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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, the positive pressure fluid would be an inert gas such as carbon dioxide or nitrogen, although air is preferable to no exclusion whatsoever.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com