<http://webisa.webdatacommons.org/452158018>	<http://www.w3.org/ns/prov#value>	" Piston rings and packing are usually made of TFE-based materials or carbon or other synthetic material" .
<http://webisa.webdatacommons.org/452158018>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/104665805>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/452158018> .
<http://webisa.webdatacommons.org/452158018>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<docstoc.com> .