Von
Duprin
http://w3.securitytechnologies.com/Products/exit_devices/Pages/default.aspx
Von Duprin is the leading brand of security door
products and manufacturer of door exit hardware,
electrical door control products and accessories. It
was the producer of the first "panic bar" style door
mechanism that allows a door to a public building to
be locked from the outside but still easy to exit from
the inside.
