About: http://webisa.webdatacommons.org/21587135

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 upper end of bore 24 passing through head 22 is internally threaded as shown at 29, and the head 22 is formed with a tool-receiving (.e.g.screw-driver) notch as shown at 29'.The internal rod-shaped member 3 is a spreading member.
http://www.w3.org/ns/prov#wasQuotedFrom	patentgenius.com