General view of instrument journeyman Willard Van Wingerden operating a 16mm film projector at a Dow Chemical Company employee group meeting. Wingerden was a member of Dow's Instrument Department, which was responsible for the installation and maintenance of the assorted apparatus necessary to manage the plant's production facilities and processes.
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Dow Chemical Company. “Film Projector at Dow Chemical Company Plant,” February 24, 1948. Dow Chemical Company Historical Image Collection, Box 6, Folder Plants--Instrument Department. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/n583xv51j.
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