The Beckman chloride/carbon dioxide analyzer was used to measure both gasses in biological fluids like sweat, blood, and spinal fluid.
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Allan Dean Walker Photography. “Unidentified Man Giving a Presentation about a Beckman Cl/CO2 Analyzer,” n.d. Beckman Historical Collection, Box 58, Folder 83. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/3x816m71n.
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