About: http://webisa.webdatacommons.org/449973314

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	Prisms 110, 112, and 114 may be either manufactured individually, made of glass and cemented together or, if made of optical plastic such as PMMA may be molded as a single unit.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com