About: http://webisa.webdatacommons.org/441332379

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	Further, it is especially difficult to fabricate such lenses with a focal length sufficient to maintain a reasonable working distance from the workpiece.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca