PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Some of the contaminants which may be removed are gases including carbon dioxide, nitrogen, water vapor, hydrogen sulfide, helium, and other trace gases, and liquids including water, heavy hydrocarbons, and other liquids. The hydrocarbon gas
http://www.w3.org/ns/prov#wasQuotedFrom
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