About: http://webisa.webdatacommons.org/326970030

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	This communication system, which avoids many of the difficulties of the prior art, comprises essentially two types of elements:
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca