About: http://webisa.webdatacommons.org/260577338

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	It should be understood that steering of acoustic beams may also be achieved by a moving mirror or by a phased array ultrasonic transducer, and that such a mirror or other arrangement may be present in the active portion.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com