NEC Corp. overcharged the Defense Agency a combined 63 million yen between 1997 and 2001 in five equipment contracts, according to internal agency documents obtained Monday by Kyodo News.

The agency later demanded that NEC return the overcharged amount. The firm complied after admitting its wrongdoing, but the agency did not disclose the case because NEC was a subcontractor, a senior agency official said.

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