<http://webisa.webdatacommons.org/prov/50103748>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/411652222> .
<http://webisa.webdatacommons.org/411652222>	<http://www.w3.org/ns/prov#value>	"Check valve 138 preferably is formed of a flexible material such as a soft plastic or neoprene rubber." .
<http://webisa.webdatacommons.org/411652222>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.es> .
<http://webisa.webdatacommons.org/411652222>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .