This letter includes a report on existing Beckman trademarks as of 1947, including information on the "acidimeter" and the point at which that instrument became known as the pH meter (1935).
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Taylor, Edwin W. “Letter from Edwin W. Taylor to Arnold O. Beckman,” August 15, 1947. Beckman Historical Collection, Box 14, Folder 12. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/kw52j898z.
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