Manufacture, sales and repair of primary and onboard support engines for ordinary cargo and passenger ships and fishing boats, and diesel engines for power and electricity generation, Design, manufacture, sales and leasing of ship equipment and ocean observation equipment, Design, manufacture, sales and leasing of industrial, civil engineering and building machinery, and transportation and shipping equipment. Design, manufacture, installation and sales of pollution prevention equipment. Design, manufacture and sales of measurement devices and astronomical observation equipment for use in satellites. Manufacture and sales of forged goods (ordinary cast iron, ductile cast iron) and forged steel products. Leasing and management of goods and real estate