<http://webisa.webdatacommons.org/prov/334208478>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/89703903> .
<http://webisa.webdatacommons.org/prov/333577933>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/89703903> .
<http://webisa.webdatacommons.org/89703903>	<http://www.w3.org/ns/prov#value>	"FIGS. 1A and 1B are a schematic views showing a top drive rig with one embodiment of a top drive swivel incorporated in the drill string;" .
<http://webisa.webdatacommons.org/89703903>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/89703903>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.es> .