About: http://webisa.webdatacommons.org/447028573

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	To preform the covering, a durable mold which can be finished to have a relatively smooth surface, such as one made of steel, is used.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com