About: http://webisa.webdatacommons.org/123736433

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	U.S. Pat. No. 4,819,620 (Okutsu) describes an endoscope guide pipe which is rigid and formed from a transparent material such as glass or plastic.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es