Photograph of men working on aircraft ignitions-starters and generators at the Sacramento Air Depot, California, March 20, 1940.
Inscription: "Ignition-starters and [generators]. Eng. Dept. S.A.D. 3-20[-40]. S.A.D. 40-114."
Photograph of a work area for the Photostat and blueprint drafting section at the Sacramento Air Depot, California, March 20, 1940. Two men work with the drafting equipment.
Inscription: "Photostat & blueprint drafting section. Eng. Dept. S.A.D.…
Photograph of Martin B-10/B-12 aircraft being assembled at the Sacramento Air Depot, California, circa, 1940s.
Inscription on verso: "S.A.D. (S_ Air Depot). B-10 bomber assy [assembly]. Circa 1940."