About: http://webisa.webdatacommons.org/173122482

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	telephone intercept systems and more particularly to a telephone intercept system based on the use of the three-way conference feature of a main telephone exchange.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com