Workers assembling Boeing B-17 Flying Fortress gas tank doors, Briggs Manufacturing Company

View of workers assembling gas tank doors for the Boeing B-17 Flying Fortress bomber at the Briggs Manufacturing Company in Detroit, Michigan. Label on back: "Some Boeing Flying Fortress gas tank doors, with more than 4,970 rivets and 100 major parts, being assembled at the Briggs Manufacturing Company's plant in Detroit, Michigan. Here for the first time in the automobile industry, important parts for American bombers are being turned out in volume. Other aircraft parts made now by Briggs include 70 different Boeing ducts, Douglas wings and Vought-Sikorsky wings. (206). Briggs Manufacturing Company, Detroit, Michigan." Handwritten on back: "Aircraft--Bombers (Parts & assembly)."