About: http://webisa.webdatacommons.org/163872286

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	Ricoh Optical also works with various optical materials, Crystals (Quartz glass), Fluorite, and others specialized materials as well e.g. Ge (Germanium).
http://www.w3.org/ns/prov#wasQuotedFrom	ricoh.co.jp