About: http://webisa.webdatacommons.org/222497130

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	tions (8), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetDevice for closing off a mine gallery especially for use to prevent spreading of underground explosions
http://www.w3.org/ns/prov#wasQuotedFrom	google.com