Close-up view of chemist Lawrence Clark making an adjustment to the recording unit of a Perkin-Elmer Sigma gas chromatography system at the U.S. Army Chemical Test Branch laboratory located in Edgewood, Maryland. Per notations accompanying the photograph, the system is being used to conduct quality assurance tests and other analyses.
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Perkin-Elmer Corporation. “Perkin-Elmer Gas Chromatography System in Use at U.S. Army Chemical Test Branch Laboratory,” 1970–1979. Photographs from the Perkin-Elmer-Applera Collection, Box 5. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1j92g8304.
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