Group photograph of four unidentified individuals posed around a Perkin-Elmer Model 137 Infracord Spectrophotometer. A hand-written sign reading "1,000th" is mounted on top of the instrument, suggesting that this spectrophotometer may have been the 1,000th manufactured or sold by Perkin-Elmer.
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Perkin-Elmer Corporation. “Perkin-Elmer Model 137 Infracord Spectrophotometer,” 1960–1969. Photographs from the Perkin-Elmer-Applera Collection, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/2n49t2601.
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