Man working at an elaborate electronic desk inside an electronics plant, ca.1940 

Electronics (?) plant with workers, ca.1940 

Women workers in an unidentified electronics office, ca.1950 

Worker using a microscope to adjust machinery in an unidentified electrical (electronics?) plant, [s.d.] 

Plumbing and heating equipment inside an unknown plant, ca.1930 

Women workers handling panels of coils in an unidentified electronics office, ca.1950 

Male electronics worker and apparatus, ca.1950 

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

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

Workers lowering machinery inside the Northrop Corporation's Plant, ca.1950 

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

Man in an unidentified factory interior, ca.1940 

Interior of an unidentified office that has electronics, ca.1950 

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

Several men inside the interior of an unidentified factory, ca.1930 

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

Unidentified citrus processing plant, ca.1910 

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

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

Three workers inside a factory, surrounded by large sacks, ca.1930