Quaker Oats company was started in 1901 by amalgamation of 4 cereal milling companies.
- Quaker Mill Company of Ravenna,Ohio.: Henry D. Seymour, one of the founders of Quaker Mill company, trademarked the Quaker brand in 1877, making it the first registered trademark for a breakfast cereal. Though none of the founding members were Quakers , the image was chosen, for the Quakers represented purity, simplicity and quality as per the encyclopedia article that Seymour was inspired by.
- A cereal mill in Iowa
- The German Mills American Oatmill Company, owned by the "The Oatmeal King"
- The Rob Lewis & Co. American Oats and Barley Oatmeal Corporation.