CORNING, United States (AFP) - China has accused the world's top optical fiber producers in the United States, South Korea (news - web sites) and Japan of dumping, US technology group Corning Inc. said. Corning said it had received a preliminary determination from the Chinese trade ministry that it had dumped US-made "single-mode optical fibre," causing injury to Chinese producers. The Chinese authorities also named the other major manufacturers: Japanese giant Furukawa and its US-based OFS subsidiary, and South Korean groups Samsung and LG, a Corning official said. The preliminary ruling against Corning means Chinese importers of its optical fiber...