About: http://webisa.webdatacommons.org/4183733

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	Particularly, presently available commercial optical switches are based on pure mechanical movements, micro-mechanical movements (MEMS) or optically birefringent materials such as liquid crystals.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com