About: http://webisa.webdatacommons.org/83058584

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	Tubes with inner and outer concentric lumens are known in the art, such as the tubes disclosed in the following patents, the full disclosures of which are all incorporated herein by this reference:
http://www.w3.org/ns/prov#wasQuotedFrom	google.com