About: http://webisa.webdatacommons.org/385603486

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	The disc may be made of rigid material such as sheet metal, but preferably is formed of the same sheet stock, say waxed cardboard, which is employed to form the wall.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com