About: http://webisa.webdatacommons.org/73851950

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	But you cannot say that its frequency is 445 Hz, because by definition, a frequency is a signal whose amplitude never changes.
http://www.w3.org/ns/prov#wasQuotedFrom	hydrogenaud.io