First marketed in 1960, the Beckman/Spinco Model 120 Amino Acid Analyzer used the Spackman-Stein-Moore technique of amino acid chromatography. The Model 121, which debuted in the late 1960s, does the same process, but faster.
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“Beckman Model 121 Amino Acid Analyzer and a Lab Coat Draped over an Empty Chair,” 1969–1978. Beckman Historical Collection, Box 77. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/xw42n801m.
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