About: http://webisa.webdatacommons.org/156822571

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Before it is processed, it contains impurities such as copper or silver, which are removed to make ???
http://www.w3.org/ns/prov#wasQuotedFrom	beltconveyers.net