About: http://webisa.webdatacommons.org/401650277

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 invention is a circuit for reducing echo back signals on a communication line comprising a summing circuit coupled to the communication line for bidirectional communication of signals therewith.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com