UPDATE 1-Idemitsu plan to take stake in Showa Shell gets regulatory nod

TOKYO, Dec 19 (Reuters) - Japan anti-monopoly regulator said

on Monday it had approved plans by Idemitsu Kosan Co to

take a stake of just under a third in rival refiner Showa Shell

Sekiyu KK for about 170 billion yen ($1.5 billion).

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