About: http://webisa.webdatacommons.org/375621117

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 second acoustic matching material 9 is made of a composite material obtained by mixing a metal or an oxide into a resin or various kinds of resins, and the acoustic impedance thereof is set to be in a range of 1.5 to 3 MRayl.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com