About: http://webisa.webdatacommons.org/248415401

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	It is desirable that the drive wheels 3a be formed of such material as aluminum so as not to damage the pipe internal wall and that the push wheels 3b be formed of synthetic resin such as polyurethane.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com