About: http://webisa.webdatacommons.org/218466816

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	These perforated tubular members may be formed of aluminum, or other appropriate material, and as mentioned they function as silencers further to inhibit false echos back to the receiver transducer 166a.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr