<http://webisa.webdatacommons.org/135696306>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/135696306>	<http://www.w3.org/ns/prov#value>	"The material selected is an acoustically efficient plastic material with a low speed of sound, and thus, low speed of longitudinal vibration." .
<http://webisa.webdatacommons.org/prov/61168507>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/135696306> .
<http://webisa.webdatacommons.org/135696306>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<freepatentsonline.com> .