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<http://webisa.webdatacommons.org/prov/440386109>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/163201757> .
<http://webisa.webdatacommons.org/163201757>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/163201757>	<http://www.w3.org/ns/prov#value>	"causing said locking means to lock the cover in closed position, circuit means including a switch to control operation of the vacuum pump, and mea" .