General view of an unidentified technician checking the flatness of a 45-inch beryllium mirror manufactured by the Perkin-Elmer Corporation. Per notations accompanying the photograph, the lightweight metal mirror was designed for use in a new telescope system.
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Perkin-Elmer Corporation. “Beryllium Mirror Fabricated by Perkin-Elmer Corporation,” 1960–1969. Photographs from the Perkin-Elmer-Applera Collection, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/5x21tg151.
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