About: http://webisa.webdatacommons.org/147190745

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 invention according to claim 1, wherein the said one member is wood having a relatively high percentage the of natural oil and the other member is a vitreous material having a high hardness rating. 4.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk