<http://webisa.webdatacommons.org/prov/223378819>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/140646133> .
<http://webisa.webdatacommons.org/140646133>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/140646133>	<http://www.w3.org/ns/prov#value>	"According to MIT???s site on electric ship history here, ???the early electrically powered naval vessels employed two electrical systems: one for propulsion and the other for services such as lights, radar, sonar, cargo pumps, cranes and any other required systems.??? After the 1940s most electric-drive ships fell out of favor because of the inefficiency of having two separate electric systems." .
<http://webisa.webdatacommons.org/140646133>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<wig-wags.com> .