About: http://webisa.webdatacommons.org/38827547

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	These transmitted and received signals may be ultrasonic or they may be sonic, for example DTMF or DTMF-like signals as known in the art.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es