Founded in 1917 as the Wisconsin Duplex Auto Company, the company was created to build a severe-duty four-wheel-drive truck. After the first prototype was built, the company began to develop rapidly. This first four-wheel-drive truck, known today as "Old Betsy", is still owned by Oshkosh Corporation and housed in the new Global Headquarters building in Oshkosh. The vehicle still runs and is used frequently in demonstrations and parades. The first mass-produced truck was the 2-ton Model A, with seven produced in 1918. The 3.5-ton Model B and 5-ton Model F followed. The Model TR, introduced in 1933, was a diversification for the company and was the first rubber tired earthmover ever built.