- Caterpillar Inc., also known as CAT , is a US-based company that manufactures construction, mining, and other engineering equipment - Founded in 1925 - The world's largest manufacturer of construction equipment - Caterpillar's Tucson Campus includes three facilities: The Tucson Mining Center is located in downtown Tucson; The Tucson Proving Ground and Tinaja Hills Demonstration & Learning Center are located south of the city near Green Valley