About: http://webisa.webdatacommons.org/74487248

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	Spherical lenses, windows, mirrors, wedges, domes, and other elements can be supplied in various substrate materials, including optical and filter glasses, plastics, fused silicas, quartz, and IR materials.
http://www.w3.org/ns/prov#wasQuotedFrom	thomasnet.com