General view of the main office space at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Per notations accompanying the photograph, this office was used by the Treasurer and Secretary's Assistant. 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, cooling towers, and steam locomotives.
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Dearborn Chemical Company. “Main Office at Dearborn Drug and Chemical Works Facility.” Album of Early Dearborn Chemical Company Facilities, 1890s-1905, circa 1905. BetzDearborn, Incorporated Records, Box 18, Volume 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/x346d526m.
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