About: http://webisa.webdatacommons.org/255753785

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	Accordingly, what is required is a design of a rotary valve system which also incorporates the ability to advance or retard the valve opening timing to better accommodate the various operating requirements of the engine.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com