 Complete the following phrase:  The Duesenberg brothers began racing bicycles and motorcycles in the 1890s and turned to auto racing after the turn of the twentieth century. Along with other automobile makers, they used the Indianapolis Motor Speedway as a test track for their cars. Duesenberg entries participated in Indianapolis 500-mile auto races for nearly twenty years, and were especially active between 1912 and 1932, when Augie served as the teams supervisor and chief mechanic. The first Duesenberg entry in the Indianapolis 500-mile race occurred in 