About: http://webisa.webdatacommons.org/246977811

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 slide is a standard item available from a number of commercial sources, including the Corning Glass Works, in Corning, New York.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com