The story
In 1935 Cass-Clay Cooperative Creamery opened its first plant in Moorhead Minnesota
It is named for the neighboring counties of Cass, in North Dakota, and Clay, in Minnesota.
In 2007 it was acquired by Associated Milk Producers Inc. and in 2012 it was purchased by Kemps LLC
From Wikipedia’s article on Cass-Clay, shared under CC BY-SA 4.0.4