About: http://webisa.webdatacommons.org/400717631

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	However, there is a problem that it is difficult to manufacture the light transmission layer having a uniform thickness, resulting in a difficulty to reproduce the information signals stably.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com