About: http://webisa.webdatacommons.org/341456089

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 or more of the discrete targets may be connected to an electrical circuithaving an audio or audio signal generator such as an audio frequency oscillator connected to a permanent magnet speaker.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com