About: http://webisa.webdatacommons.org/400828174

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	Ignition by friction, with impact on each other or on other materials such as steel or concrete, in which an ???ordinary??? (mechanical or frictional) spark is generated.
http://www.w3.org/ns/prov#wasQuotedFrom	occsafetynhealth.com