Posted by Fred Steiner on Monday, February 5, 2018
This plate belongs to Duane Bollenbacher, retired Bluffton math teacher, and here's a short explanation:
"The Ohio Council of Teachers of Mathematics (OCTM) was organized and had its first-ever conference in the spring of 1951 - hence "51." Duane joined in the 1960s. That photo is on the OCTM website.
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