<http://webisa.webdatacommons.org/prov/81781813>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/173607894> .
<http://webisa.webdatacommons.org/173607894>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.ca> .
<http://webisa.webdatacommons.org/173607894>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/53322558>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/173607894> .
<http://webisa.webdatacommons.org/173607894>	<http://www.w3.org/ns/prov#value>	"The position sensors are formed by devices such as a photocoupler and a potentiometer." .