About: http://webisa.webdatacommons.org/226951519

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	ifting the coupler socket (not shown) off the coupler ball (not shown) on the rear end of a towing vehicle, and FIG. 2 is a section in a vertical plane through the upper end of the jack showing the improved ball bearing construction.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com