Material Fact: Oi Announces Change in Management

RIO DE JANEIRO, June 20, 2013 /PRNewswire/ -- Oi S.A. ("Oi"), pursuant to art. 157, §4, of Law No. 6,404/76, and in accordance with CVM Instruction No. 358/02 and best corporate governance practices, notifies its shareholders and the market in general of the departure of its Chief...

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