About: http://webisa.webdatacommons.org/149398121

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	In this case, echoes known as second-time around echoes, i.e. from objects having reflected the penultimate transmitted pulse, may appear and are not distinguishable from echoes having reflected the last transmitted pulse.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com