About: http://webisa.webdatacommons.org/397093089

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The polishing system of Fry determines that the tracer layer has been reached when a chemical element detector detects materials such as boron or phosphorous of the tracer layer have been removed by the polishing process.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com