<http://webisa.webdatacommons.org/prov/387627649>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/113171009> .
<http://webisa.webdatacommons.org/prov/352555050>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/113171009> .
<http://webisa.webdatacommons.org/prov/134443590>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/113171009> .
<http://webisa.webdatacommons.org/113171009>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/421373531>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/113171009> .
<http://webisa.webdatacommons.org/113171009>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com.au> .
<http://webisa.webdatacommons.org/113171009>	<http://www.w3.org/ns/prov#value>	"This invention relates to an apparatus and method for use in drilling wells, and more particularly to an apparatus and method for controlling the operation of a motor used for operating a drill stem." .