About: http://webisa.webdatacommons.org/216053122

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	The inner surface of the tubular member 15 is roughened, such for example as by a number of longitudinally extending corrugations 16 or projections.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com