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    • 2000-Apr

    The photographs document birthday celebrations.

    Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical…

    • 1998

    The photographs document birthday celebrations.

    Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical…