About: http://webisa.webdatacommons.org/333912840

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	We have all done this at one time or other via a satellite; when you tap the microphone, it sends out a pulse, and a moment later the echo comes back.
http://www.w3.org/ns/prov#wasQuotedFrom	amsat.org