<http://webisa.webdatacommons.org/406942066>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/490512885>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/406942066> .
<http://webisa.webdatacommons.org/406942066>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.es> .
<http://webisa.webdatacommons.org/406942066>	<http://www.w3.org/ns/prov#value>	"A heating element is used at least near the parts used to hold the various types of holders and the nature of the needle-like tip can be selected depending upon the desired structure of the thermionic emission cathode." .
<http://webisa.webdatacommons.org/prov/495728129>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/406942066> .