About: http://webisa.webdatacommons.org/23600768

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	A tone detector 739 is used to monitor and detect dual tone multifrequency (???DTMF???), facsimile and other call processing tones and signals.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au