About: http://webisa.webdatacommons.org/281548189

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	The fitting cross can be marked by a point produced on the lens, before fitting in the frame, by a cross or any other mark such as a point surrounded by a circle marked on the lens, or by any other appropriate means.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com