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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	Noble metal has a minimum chemical reaction against optical glass, however, a mechanical property thereof, such as hardness or strength, is inferior to that of other materials.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com