<http://webisa.webdatacommons.org/prov/337963166>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/246439682> .
<http://webisa.webdatacommons.org/246439682>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/334813002>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/246439682> .
<http://webisa.webdatacommons.org/246439682>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/246439682>	<http://www.w3.org/ns/prov#value>	"The previous discussion has implicitly assumed that printed circuit boards, silicon wafers, or other substrates have only one layer." .