Mitsubishi Kakoki Kaisha, Ltd. provides engineering, procurement, and construction services for industrial and chemical plants and environmental control facilities in Japan, Asia, and internationally. It operates through Engineering and Machinery segments. The Engineering segment covers city gas and petroleum plants, chemical engineering plants, hydrogen generation plants, sewage and industrial effluent treatment equipment, water treatment equipment, and corrosion-resistant containers made of fiber-reinforced plastic (FRP). The Machinery segment offers oil purifiers, separators, filtration machinery, seawater screening facilities, and mixers. The company was formerly known as Kakoki Seisaku, Ltd. and changed its name to Mitsubishi Kakoki Kaisha, Ltd. in 1938. Founded in 1935, it is headquartered in Kawasaki, Japan.