About: http://webisa.webdatacommons.org/423286917

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 economical advantages of the safety-lamp, one of the most happy applications of a scientific discovery to a useful purpose ever made, must be estimated on the same principle.
http://www.w3.org/ns/prov#wasQuotedFrom	econlib.org