About: http://webisa.webdatacommons.org/61259331

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 wellhead protrudes a few feet above the mudline and is provided with a platform or other suitable supporting means, not shown, to which the chamber is joined to provide a watertight seal.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com