About: http://webisa.webdatacommons.org/329994436

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	An inorganic fine powder of TiO2, Al2 O3, SiO2, or other substance was uniformly mixed into the protective ridges 5 to enhance the mechanical strength of the ridges 5.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com