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    • circa 1905

    General view of employees at work in the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. The employees are identified…

    • circa 1905

    Close-up view of scientific apparatus used at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the Dearborn Chemical…

    • circa 1905

    Close-up view of scientific apparatus used at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the Dearborn Chemical…

    • circa 1905

    General view of a section of the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois, with view of assorted glassware and…

    • circa 1905

    General view of a section of the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois, with view of assorted glassware and…

    • circa 1905

    Close-up view of assorted scientific instruments used at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the…

    • circa 1905

    Close-up view of two balances used at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the Dearborn Chemical Company…

    • circa 1905

    General view of a section of the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois, with view of assorted glassware and…

    • circa 1905

    View of a portion of the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Per notations accompanying the photograph, the…

    • circa 1905

    Close-up view of assorted scientific instruments, including microscopes and balances, used at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago,…

    • circa 1905

    General view of the main room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois, with view of assorted glassware and scientific…

    • circa 1905

    General view of the drug storage room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the Dearborn Chemical…

    • circa 1905

    Close-up view of the bucking board and crusher used to prepare coal and ore samples for analysis at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in…

    • circa 1905

    Close-up view of the assay and combustion furnaces in the laboratory back room at the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois.…

    • circa 1905

    General view of a portion of the Dearborn Drug and Chemical Works (later Dearborn Chemical Company) 35th Street laboratory facilities located in Chicago, Illinois, with view of furnaces, assorted balances, and…

    • circa 1905

    Album containing 25 photographs depicting early facilities associated with Dearborn Drug and Chemical Works (later Dearborn Chemical Company) in Atlantic City, New Jersey and Chicago, Illinois. Founded in 1887, the…

    • circa 1924

    General view of employee C.C. Dennis using a mortar and pestle to crush specimens for use at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in…

    • circa 1924

    General view of employee Anton H.R. Noreen conducting an analysis of coal samples at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in 1887, the…

    • circa 1924

    General view of employee Anton H.R. Noreen preparing samples for testing at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in 1887, the Dearborn…

    • circa 1934

    General view of a laboratory work bench at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility, with view of assorted glassware and scientific apparatus. The employee visible in the…

    • circa 1934

    General view of employee Al Slisg conducting a water analysis test at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in 1887, the Dearborn…

    • 1934

    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…

    • 1924

    General view of an unidentified female laboratory technician preparing a water sample for analysis at the Dearborn Chemical Company's 35th Street Laboratory. Founded in 1887, the Dearborn Chemical Company was a…

    • circa 1938

    General view of an unidentified employee preparing a water sample for testing at a Dearborn Chemical Company's laboratory facility in Chicago, Illinois. A stamp on the verso of the photograph for "The Fensholt Company,"…

    • 1962 – 1963

    General view of employees at work in the Analytical Laboratory at the Dearborn Chemical Company's 35th Street laboratory facility located in Chicago, Illinois. The two employees visible in the foreground of the…