About: http://webisa.webdatacommons.org/157242638

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	It is desirable that the frequency poles by low frequency poles, such as at or below 300 Hz, and more particularly below 50 Hz.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com