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You searched for Genre Photographs Remove constraint Genre: Photographs Subject Clowns Remove constraint Subject: Clowns Date 1920 to 1929 Remove constraint Date: <span class='from'>1920</span> to <span class='to'>1929</span>
- circa 1920
Arnold O. Beckman at a Delta Upsilon party during his time at the University of Illinois, 1918-1923.
Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began…