<http://webisa.webdatacommons.org/prov/453743658>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/166087962> .
<http://webisa.webdatacommons.org/166087962>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/166087962>	<http://www.w3.org/ns/prov#value>	"This involves making sure that the surfaces to be welded are clean, free of paint, rust, grease, dirt, or other materials." .
<http://webisa.webdatacommons.org/prov/461439110>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/166087962> .
<http://webisa.webdatacommons.org/166087962>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<rodauthority.com> .