About: http://webisa.webdatacommons.org/145643006

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	Active control systems are typically effective at lower frequencies such as below 1000 Hz.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com