About: http://webisa.webdatacommons.org/198155765

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	According to an example embodiment, blocking element 702 is a material whose opacity is controllable, such as a polarized glass, according to an electrical or magnetic stimulus.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com