About: http://webisa.webdatacommons.org/312369041

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	At all times other than the time of the last wave, the combined outputs cancel one another, thus providing a combined signal w ch is substantially zero except for a sharp pulse representing each reflection.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es