About: http://webisa.webdatacommons.org/179973305

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	device of the permanent magnet system requires no energy such as electric power and is cost-effective.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com