A cooperation pact between a Mitsui Engineering & Shipbuilding (MES) unit and Tsuneishi Shipbuilding will consolidate the Japan­ese industry into three distinct and growing groups.

Two of these groups are aiming to gain an advantage by combining the advanced technical and engineering know-how of Japan’s industrial conglomerates with the lower-cost production of its medium-­sized family-owned shipbuilders.

MES and the Kambara family-­owned Tsuneishi have worked ­together in the past, having formed an alliance in the 1970s that has diminished over the years.