About: http://webisa.webdatacommons.org/110980930

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	This could be achieved in an electrically powered system by using an AC induction motor and varying the speed through any of several methods, including variable frequency or phase control.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com