About: http://webisa.webdatacommons.org/126467390

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	None Not having a power source is an option for some high vacuum pumps such as turbomolecular, where vacuum is increased by molecular absorption rather than mechanically moving parts.
http://www.w3.org/ns/prov#wasQuotedFrom	globalspec.com