These cowl flap controls were installed exclusively on B17 Flying Fortresses, and no other aircraft. Two American companies manufactured these panels during WWII. They were Adel and Gladden. These reproduction (non-airworthy) units are of the Adel type, and are for display purposes only. The plates were laser cut from 1/8" thick aluminum. The front aluminum metallic labels were professionally made from an original Adel plate. Made in the USA.