<http://webisa.webdatacommons.org/15330087>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/1474084>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/15330087> .
<http://webisa.webdatacommons.org/15330087>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<patents.com> .
<http://webisa.webdatacommons.org/15330087>	<http://www.w3.org/ns/prov#value>	"hazardous materials have also to be removed including acetylene and other hydrocarbons." .