Close-up of a man working a machine inside an unidentified factory, ca.1935 

Several men at the National Supply Company factory interior, ca.1930 

Man in an unidentified factory interior, ca.1940 

Two men working at a machine inside an unidentified factory, ca.1942 

Interior view of an unidentified factory, showing three men at a large engine, ca.1940 

Two male workers inside a factory, ca.1930 

Two men conferring inside an unidentified factory, ca.1950 

Unidentified factory interior, ca.1950 

Men working inside the Harvey Aluminum factory, ca.1940 

Interior of an unidentified factory, showing two factory workers gripping a large piece of equipment, ca.1935 

Unidentified factory interior, ca.1940 

Interior view of an unidentified factory,showing workers from behind, ca.1940 

Interior view of an unidentified factory, with two suited men inspecting metal parts, while workers are on an assembly line in background, ca.1942 

Men standing near tables in the interior of an unidentified factory, ca.1920 

Interior of a factory with metal workers, ca.1930 

Interior view of an unidentified factory, perhaps a war (?) industry plant, ca.1942 

Close-up of a man chiseling something inside an unidentified factory, ca.1940 

Interior of a metal factory, ca.1930 

Interior of an unidentified factory where a worker is "machining heat exchanger bodies", ca.1930 

Interior view of the Ray Day Piston Factory in Seattle, Washington, 1930-1940