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Nippon Steel-Toyota feud harks back to tech leaks to South Korea

POSCO espionage case seen at heart of patent suits between Japanese partners

A Nippon Steel plant in Kure, Hiroshima. (Photo by Mao Kawano)

TOKYO -- Nippon Steel's patent infringement lawsuits against Toyota Motor and China's Baoshan Iron & Steel are an extremely rare case of a Japanese materials company taking one of its principal domestic customers to court.

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