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    • circa 1930

    General view of employee Al Woodward preparing polished plates for a corrosion test at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical…

    • circa 1930

    General view of employee A. Sherwood preparing agar and gelatin plates for use in the bacteriological analysis of water at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded…

    • circa 1924

    General view of balances in use at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph are identified as Charles S. White (left) and C.C.…

    • circa 1924

    General view of a work bench in the factory control work area of the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph is identified as W.…

    • circa 1924

    General view of an extraction rack in use at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph is identified as A. Sherwood. Per notations…

    • 1930s

    General view of two unidentified employees filling barrels at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

    • 1930s

    General view of two unidentified employees filling barrels at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

    • circa 1924

    General view of two unidentified employees at work in a machine room at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a…

    • circa 1924

    General view of an unidentified employee at work in a store room at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant, with view of assorted barrels and other containers. Founded in…

    • circa 1924

    General view of an unidentified employee at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

    • circa 1924

    General view of an unidentified employee at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

    • circa 1924

    General view of several unidentified employees at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor…

    • circa 1924

    General view of several unidentified employees at work in the barrel storage area at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical…

    • circa 1924

    General view of two unidentified employees at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

    • circa 1924

    General view of several unidentified employees filling barrels at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

    • circa 1924

    General view of several unidentified employees packing materials for shipment at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company…

    • circa 1924

    General view of an unidentified employee at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

    • circa 1924

    General view of several unidentified employees at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor…

    • 1930s

    General view of Dearborn Chemical Company employee C.B. Smith utilizing a concentration hydrometer during a water sample field test. Assorted glassware and a Dearborn portable testing cabinet are also visible on the…

    • 1930s

    General view of two unidentified men utilizing a Dearborn Chemical Company portable testing cabinet to conduct a water sample field test. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

    • 1930s

    General view of Dearborn Chemical Company engineer F.B. Horstmann utilizing a portable testing cabinet to conduct a water sample field test. A stamp on the verso of the photograph for "The Fensholt Company," a public…

    • 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,"…

    • 1930s

    General view of Dearborn Chemical Company employee E.P. Fager preparing a water sample for testing. A stamp on the verso of the photograph for "The Fensholt Company," a public relations firm based in Chicago, suggests…

    • 1936-Aug-18

    General view of Dearborn Chemical Company representative C.M. Kesler (seated) and hospital employee "Mike" examining a sample of water at Mary's Help Hospital (now Seton Medical Center) in San Francisco, California. Per…

    • 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…