About: http://webisa.webdatacommons.org/216501281

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 complementary, semi-cylindrical portions 5 and 6 may be drawn, rolled or otherwise provided in the plates 7 and 8 and are then joined together by brazing, welding, riveting or other mechanical means to form the elongated tubes.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com