About: http://webisa.webdatacommons.org/38309811

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 bushings may be of bronze, plastic, or other oil or self-lubricated material.According to various embodiments of the invention, one or both of grippers may be integral with its respective outer sprocket or inner hub.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com