About: http://webisa.webdatacommons.org/155909489

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	A valve controller 19 b composed of molded plastic, or other rigid material, has a circular section 90 having an opening 92 to an interior surface forming a cam 94, and a recessed retainer ring 95.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com