Factory workers operating on machinery, showing pallet of buckets in foreground, ca.1930 

Unidentified factory interior, showing workers adjusting a small slab beneath a large machine, ca.1930 

Interior view of an unidentified factory, with a close-up of male worker, ca.1940 

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

Close-up view of female factory worker examining a small metal component, ca.1940 

Close-up of machinery in a rubber factory, ca.1945 

Interior view of a factory, showing large hydraulic press at center, May 1937 

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

Factory worker working with large machinery, ca.1950 

Interior of a factory with metal workers, ca.1930 

Interior view of unidentified factory, showing a single worker standing near the turbines, ca.1935 

Factory worker manipulating a large white tire with machinery, ca.1930 

Woman factory worker sorting wrapped candy at a table, ca.1940 

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

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

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

Factory worker in a kiln of a ceramics factory, ca.1935 

Close-up view of woman worker handling a panel with knobs at Ircal Industries, ca.1940 

Unidentified factory interior, ca.1950 

Interior view of unidentified factory, showing piles of fabric in the foreground, ca.1940