DONG-I INDUSTRIAL Co., is the biggest manufacturer of marine transmission, steering system and power take off for marine utility in South Korea. South Korea has the long coastline, rivers, thousands of islands and ten thousands of vessels. This geographic condition becomes the nutrient on which Korean maritime industry has been developed to the extent of world-level industry with a viewpoint of technology and scale. In this environment, DONG-I launched its entity by manufacturing hydraulic marine transmission having the motto, ? BETTER AND BETTER PRODUCTS FOR THE FULL SATISFACTION OF CUSTOMER IN ANY SEA ?