About: http://webisa.webdatacommons.org/198551036

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	Materials other than steel and brass may be used as long as the rolling friction of ball 14 in socket 16 is sufficiently low to permit rolling of the ball in the socket, without requiring ink or other fluid as a lubricant.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr