<http://webisa.webdatacommons.org/prov/63969191>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/316998690> .
<http://webisa.webdatacommons.org/316998690>	<http://www.w3.org/ns/prov#value>	"In the preferred embodiment, the relatively thick layers 612 are formed from a polymer material such as polypropylene, polyethylene or polyester (polypropylene being preferred) having a thickness of approximately 20 microns." .
<http://webisa.webdatacommons.org/316998690>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/316998690>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .