Close-up view of employee C.M. Hoffman seated at a desk at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. 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. “C.M. Hoffman at Dearborn Chemical Company Offices,” 1927–1928. BetzDearborn, Incorporated Records, Box 17, Folder 16. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/h128nf588.
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