Pioneer Flour Mills brand flour sack bearing the image of C.H. Guenther

In 1899, the company incorporated and renamed many of its products in compliance with the terms of the legal settlement between C.H. Guenther & Son and the Guenther Milling Company, operated by Carl Hilmar's son, Arthur. To emphasize its place as one of the earliest mills in South-Central Texas, the company created its Pioneer Flour Mills brand, with both sacks and barrels bearing the image of C.H. Guenther.