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<http://webisa.webdatacommons.org/52589949>	<http://www.w3.org/ns/prov#value>	"This requires centering devices such as centering tubes or collars to be installed on the bolt studs in order to allow the prior art valve to be employed." .
<http://webisa.webdatacommons.org/52589949>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/prov/302431205>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/52589949> .