1902: Founder Carl Hilmar Guenther dies at the age of 76, and Erhard becomes president.

1909: C.H. Guenther & Son, at this point preferring to be known as Pioneer Flour Mills after its most popular brand, begins an annual series of commemorative gift plates.

1914: A six-story building of steel and concrete is built to replace the 1877 frame mill building and to increase production, helping fill new orders from San Antonio's growing military establishment.

1915: Mill President Erhard Guenther transforms his parents' modest home beside the mill into a three-story landmark with oriental motifs.

1916: Motorized Packard delivery trucks begin replacing mule-drawn wagons. Delivery also soon becomes easier with replacement of wooden flour barrels by smaller and lighter cloth and paper sacks.

1918: World War I food conservation requirements lead to production of Cornserve Flour, ground from corn rather than wheat.

1919: To meet growing customer demands, financing is secured to begin doubling Pioneer's production capacity over the next 10 years.

1922: The 20-story concrete grain elevator, for a short time the tallest structure in the city, is completed. Today, it is still a well-recognized landmark in San Antonio.

1924: Additional construction is highlighted by a seven-story mill building of reinforced concrete.