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<http://webisa.webdatacommons.org/prov/122776881>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/109935781> .
<http://webisa.webdatacommons.org/109935781>	<http://www.w3.org/ns/prov#value>	"Cathode rays when fall only certain metals such as copper, but rays produced." .