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<http://webisa.webdatacommons.org/prov/215670102>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/30175933> .
<http://webisa.webdatacommons.org/30175933>	<http://www.w3.org/ns/prov#value>	"FIGS. 2 a and 2 b are a cross-sectional view of a prior art valve in a first and a second position respectively;" .
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