About: http://webisa.webdatacommons.org/165429456

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	Piezoelectric loudspeaker according claim 1 wherein the membrane is a CFK-sandwich membrane with a kevlar insert between a sandwich core and a cover layer thereof.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com