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Caterpillar Inc. is a United States-based corporation headquartered in Peoria, Illinois. Caterpillar (commonly referred to simply as CAT) is, according to their corporate website, "the world's largest manufacturer of construction and mining equipment, diesel and natural gas engines, and industrial gas turbines."

Famous for their products featuring continuous tracks and a distinctive yellow paint scheme, Caterpillar produces a wide range of heavy equipment, including the range of Caterpillar bulldozers. Former presidents George W. Bush and Bill Clinton have visited the Peoria area to see the company, and President Barack Obama visited in February 2009 on a stopover on his way to Lincoln celebrations in Springfield.
Caterpillar is one of the thirty companies whose stock is tracked in the Dow Jones Industrial Average. It is a Fortune 500 company, ranked number 50 in 2008, and first in its industry, with more than $30 billion in assets.

Business lines

As of the first quarter of 2006, 44% of Caterpillar's sales are to overseas customers. Caterpillar products are sold in nearly 200 countries. The company has a worldwide network of 220 dealers: 63 dealers in the United States and 157 in other countries. Caterpillar products and components are manufactured in 51 plants in the United States and 58 plants in Australia, Belgium, Brazil, Canada, England, France, Germany, Hungary, India, Indonesia, Italy, Japan, Mexico, the Netherlands, Northern Ireland, the People's Republic of China, Poland, Russia, South Africa and Sweden. Caterpillar also licenses the manufacturing of Caterpillar-branded clothing, hats, footwear, and other consumer products.
Caterpillar's historical manufacturing home is in Peoria, Illinois, where its world headquarters and core research and development activities are located. Although Caterpillar has "farmed out" much of its local parts production and warehousing to outside firms, it still has four major plants in the Peoria area: the Mapleton Foundry, where diesel engine blocks and other large parts are cast; the East Peoria factory, which has assembled Caterpillar tractors for over 70 years; the Mossville engine plant, built after World War II; and the Morton parts facility.