About: http://webisa.webdatacommons.org/384187424

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 he is most known for is a system for letting the engineer of a train know how close his train is to another train.
http://www.w3.org/ns/prov#wasQuotedFrom	insightnews.com