Oi S.A. Announces Annual Report Filed with the SEC on Form 20-F

RIO DE JANEIRO, April 30, 2013 /PRNewswire/ -- Oi S.A. (BOVESPA: OIBR3, OIBR4; NYSE: OIBR.C, OIBR) (the "Company") announces that its Annual Report on Form 20-F for the year ended December 31, 2012 was filed with the United States Securities and Exchange Commission, or SEC, on April 30,...

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