August Krebs ran on the lands, besides agricultural operations, three mills: one sawmill, which was most likely housed in the southwest in the area bordering the "Praumenmühle" (not one of his mills), a gristmill, which without doubt was housed in the main building, and an oil mill, which might have been found in the little quarrystone building in the north leaning against the property's west perimeter wall and dating from before 1841. As the J. Schmitt steam mill in Mainz-Mombach expanded in the early years of the 20th century, the traditional watermills in the area became ever less profitable, and August Krebs's mills shut down as surely as the rest. It is likely that they stopped running with his death.