Story Text: The location of black boxes from a 2009 Air France crash that killed 228 people has been sharply narrowed after technicians found what they think were signals from the flight recorders.
Air France flight AF447 between Rio de Janeiro and Paris crashed into the sea on June 1, 2009, killing all on board.
A search in 2009 found several pieces of wreckage and 50 bodies but the black box flight recorders, which could help explain the disaster, were not recovered and the causes of the crash remain unexplained.
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