About: http://webisa.webdatacommons.org/40945723

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	In the prior-art system of the mechanical type, the drive mechanism elements which have sliding parts, and rolling parts, such as gears, screws and bearings, are located in the vacuum.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com