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SAO PAULO, June 20 (Reuters) - Oi SA and six subsidiaries filed for bankruptcy protection in a Rio de Janeiro court on Monday, after Brazil's most indebted phone carrier failed to reach an agreement with creditors to restructure 65.4 billion reais ($19.27 billion) in obligations.
In a securities filing, Oi said the company will aim to maintain service quality standards during the process.
$1 = 3.3937 Brazilian reais Reporting by Guillermo Parra-Bernal; Editing by Chris Reese