<http://webisa.webdatacommons.org/228842426>	<http://www.w3.org/ns/prov#value>	"Other preferred embodiments of this check valve aspect of the invention comprise stops incorporating ???flapper??? diaphragms made of elastic material, such as natural or synthetic rubbers, or other polymers." .
<http://webisa.webdatacommons.org/228842426>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/104579001>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/228842426> .
<http://webisa.webdatacommons.org/228842426>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .