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Idemitsu took on the dominance of the major oil companies in the "Nissho Maru incident"

Opening oral arguments in Tokyo district court (May 1953)
Opening oral arguments in Tokyo district court (May 1953)
In May 1953, Idemitsu took decisive action by importing oil from Iran, which was involved at the time in a dispute with Great Britain after nationalizing its oil industry.
This would eventually lead to direct import from the oil-producing countries of the Middle East.

Claiming ownership of the cargo of the tanker Nissho Maru, Britain took Idemitsu to court, where Idemitsu's arguments prevailed.
Idemitsu's brave action against victorious wartime powers inspired the spirits of Japanese citizens.

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