About: http://webisa.webdatacommons.org/55112133

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	The transmitting circuit 1506, may operate at an audio frequency or at an ultrasonic frequency such as a frequency that may be considered a radio frequency.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es