Mitsubishi Motors Corporation is a multinational automotive manufacturer headquartered in Minato, Tokyo, Japan. In 2011, Mitsubishi Motors was the sixth biggest Japanese automaker and the sixteenth biggest worldwide by production. It is part of Mitsubishi keiretsu, formerly the biggest industrial group in Japan, and was formed in 1970 from the automotive division of Mitsubishi Heavy Industries.Mitsubishi Fuso Truck and Bus Corporation is in a separate division from Mitsubishi Motors, which builds commercial grade trucks, buses and heavy construction equipment.HistoryMitsubishi's automotive origins date back to 1917, when the Mitsubishi Shipbuilding Co., Ltd. introduced the Mitsubishi Model A, Japan's first series-production automobile. An entirely hand-built seven-seater sedan based on the Fiat Tipo 3, it proved expensive compared to its American and European mass-produced rivals, and was discontinued in 1921 after only 22 had been built.In 1934, Mitsubishi Shipbuilding was merged with the Mitsubishi Aircraft Co., a company established in 1920 to manufacture aircraft engines and other parts. The unified company was known as Mitsubishi Heavy Industries (MHI), and was the largest private company in Japan. MHI concentrated on manufacturing aircraft, ships, railroad cars and machinery, but in 1937 developed the PX33, a prototype sedan for military use. It was the first Japanese-built passenger car with full-time four-wheel drive, a technology the company would return to almost fifty years later in its quest for motorsport and sales success.