About: http://webisa.webdatacommons.org/231735087

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 marine propulsion system, preferably having dual counterrotating propellers, has an automatic multi-speed shifting mechanism such as a transmission.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk