About: http://webisa.webdatacommons.org/454000239

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	One area of application is the controlled drive of d.c. machines used in elevators, rolling mills and other cases which require motor speed control and reversal of direction of rotation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com