About: http://webisa.webdatacommons.org/398339799

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	More particularly, the invention relates to an exit device designed primarily for an outwardly opening metal door which will remain locked when subjected to severe distortions of the kind encountered in a fire or other major force.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com