The Rescue and Restoration of a Milestone Caterpillar Machine | Diggin' Into History 

In November 1936, Caterpillar's 20,000th RD-4 diesel tractor rolled off the assembly line. We're diggin' into history to learn how the milestone machine found its way back to the family farm it once called home - more than 80 years after it was originally purchased. Learn more about Caterpillar history at www.caterpilla...