About: http://webisa.webdatacommons.org/209460511

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	Examples of types of signals include electrical, electromagnetic and optical signals.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr