<http://webisa.webdatacommons.org/101775980>	<http://www.w3.org/ns/prov#value>	"However, it is difficult for even this method to prevent scratches in a soft metal such as copper." .
<http://webisa.webdatacommons.org/prov/122776858>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/101775980> .
<http://webisa.webdatacommons.org/101775980>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/101775980>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .