<http://webisa.webdatacommons.org/prov/449027793>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/201141418> .
<http://webisa.webdatacommons.org/201141418>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<drillingcontractor.org> .
<http://webisa.webdatacommons.org/201141418>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/201141418>	<http://www.w3.org/ns/prov#value>	"These elements, such as copper and tin, are known to have a deleterious effect on steel???s sustainability to sulfide stress cracking." .
<http://webisa.webdatacommons.org/prov/235386541>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/201141418> .