About: http://webisa.webdatacommons.org/373021246

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	preferably made of a light metal, such as aluminum, to prevent wear on the top portion of the protrusions over an extended period of time.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com