This machine was originally introduced as the "Caterpillar Diesel No. 12 Auto Patrol" in the summer of 1938, but was soon renamed as a "Motor Grader" just one year later. Weighing in at 20,360 pounds, the No. 12 Auto Patrol featured a 12-foot blade, had six forward speeds and two reverse speeds. This machine, as well as other auto patrol models, was primarily used in the building of roads and snow removal.