About: http://webisa.webdatacommons.org/65721555

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 length of the jib from pivot 8 to head 9 can be measured by suitable means such as a cable running from the jib head to a spring loaded drum at the jib base.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com