Seika Corporation, part of the Mitsubishi group of industrial companies, imports and exports industrial machinery such as boilers, turbines, engines, water purifiers, measuring devices, and air compressors. Mitsubishi Heavy Industries is its largest supplier, and companies in the utility and energy industries are its largest customers, although it also serves heavy engineering, environmental, textile, and chemical companies. Seika also installs and repairs the equipment it supplies. Europe, the US, and Southeast Asia are Seika's main export markets.