About: http://webisa.webdatacommons.org/391848599

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	removing the metal oxide film formed on a portion except the groove portion; and
http://www.w3.org/ns/prov#wasQuotedFrom	google.com