Skip to Content
You searched for
Subject Clowns Remove constraint Subject: Clowns

Search Constraints

Search Results

    • 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…