About: http://webisa.webdatacommons.org/323354186

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	The drive signal is a signal which causes the sound source to emit the ultrasonic waves.09-01-2011
http://www.w3.org/ns/prov#wasQuotedFrom	faqs.org