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You searched for Creator Metcalf, Edi Remove constraint Creator: Metcalf, Edi Date 1990 to 1999 Remove constraint Date: <span class='from'>1990</span> to <span class='to'>1999</span>
The photographs document birthday celebrations. The images are numbered, but the subjects are unidentified.
Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and…