The company was established 1888 as the "Nippon Oil" (日本石油, Nihon Sekiyu), or "Nisseki" (日石) for short. In 1999, the company merged with and absorbed the former "Mitsubishi Oil" (三菱石油, Mitsubishi Sekiyu). The merged company was called "Nippon Mitsubishi Oil" (日石三菱, Nisseki Mitsubishi) until...