General view of several employees conducting water analysis tests at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. The three employees visible in the foreground are identified as (left to right) Ted Slisg, Charles S. White, and C.C. Dennis. The employee visible in the background is unidentified. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of BetzDearborn, Incorporated best known for manufacturing water treatment chemicals for use in boilers and cooling towers.
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Dearborn Chemical Company. “Water Analysis at Dearborn Laboratory Facility,” 1934. BetzDearborn, Incorporated Records, Box 17, Folder 14. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/8623hz71n.
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