About: http://webisa.webdatacommons.org/13863775

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 means for rotating the hollow disc at the sufficient angular velocity is any suitable rotating means such as a sprocket connected directly to the disc or to a rotatable support shaft driven by a chain and a drive means.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com