WW2 US Army Air Force Aircraft B-17 & Fighter Camera Intervalometer Type B-3B

WW2 US Army Air Force Aircraft Camera Intervalometer Type B-3B Fairchild manufacturing company for B-17 & aircrafts. Design for B-17 bombers during WW2 for an onboard camera to use for aerial photography during raids, fly overs, etc. Not sure if this is able to still work, but makes for a very cool military piece of memorabilia for any collection. Dimensions and weight shown in photos.