About: http://webisa.webdatacommons.org/403118566

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	Patented June 14, 1966 The coupling members and shafts are made of a conductive metal, such as steel, and are provided with spaced, adjacent coupling surfaces 26 and 28.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com