About: http://webisa.webdatacommons.org/415561353

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, a practical minimum length is established by the space required for the lenses and other electron-optical elements such as deflectors, correctors and the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com