About: http://webisa.webdatacommons.org/102812873

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	Additional tubes, suction devices, fluid-providing units, or other devices may be connected to the holes or openings and may be configured to maintain the vacuum in the outer tube 10.
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com