Mitsubishi Heavy Industries, Ltd. is a Japanese multinational engineering, electrical equipment and electronics company headquartered in Tokyo, Japan. MHI is one of the core companies of the Mitsubishi Group and its automobile department is the predecessor of Mitsubishi Motors.
MHI's products include aerospace and automotive components, air conditioners, elevators, forklift trucks, hydraulic equipment, machine tools, missiles, power generation equipment, printing machines, ships, aircraft, railway systems, and space launch vehicles. Through its defense-related activities, it is the world's 23rd-largest defense contractor measured by 2011 defense revenues and the largest based in Japan.
In 1857, at the request of the Tokugawa Shogunate, a group of Dutch engineers began work on the Nagasaki Yotetsusho, a modern, Western-style foundry and shipyard near the Dutch settlement of Dejima, at Nagasaki. This was renamed Nagasaki Seitetsusho in 1860, and construction was completed in 1861. Following the Meiji Restoration of 1868, the shipyard was placed under control of the new Government of Meiji Japan. The first dry dock was completed in 1879.
In 1884, Yataro Iwasaki, the founder of Mitsubishi, leased the Nagasaki Seitetsusho from the Japanese government, renamed it the Nagasaki Shipyard & Machinery Works and entered the shipbuilding business on a large scale. Iwasaki purchased the shipyards outright in 1887. In 1891, Mitsubishi Heavy Industries - Yokohama Machinery Works was started as Yokohama Dock Company, Ltd. Its main business was ship repairs, to which it added ship servicing by 1897. The works was renamed Mitsubishi Shipyard of Mitsubishi Goshi Kaisha in 1893 and additional dry docks were completed in 1896 and 1905.