About: http://webisa.webdatacommons.org/103489451

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	A number of forms of the apparatus may be used for isolating the acoustic energy to a selected zone other than the acoustic filters shown in FIGS. 1 and 2.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com