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Australian PM confident signals are from black box

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(CNN) -- The painstaking search to find Malaysia Airlines Flight 370 got a vote of confidence Friday that the effort is headed in the right direction.

"We have very much narrowed down the search area, and we are very confident that the signals that we are detecting are from the black box on MH370," Australian Prime Minister Tony Abbott told reporters during an official visit to China.

Black boxes are the plane's flight data recorder and the cockpit voice recorder. Locator beacons attached to them are designed to emit high-pitched signals, or pings.

Over the past week, four such pings have been detected by a ping locator towed by the Australian vessel Ocean Shield.

A fifth ping, detected Thursday by a sonobuoy dropped by an airplane, is "unlikely to be related to the aircraft black boxes," Australian chief search coordinator Angus Houston said Friday.

"On the information I have available to me, there has been no major breakthrough in the search for MH370," Houston said in a prepared statement. "Further analysis continues to be undertaken by Australian Joint Acoustic Analysis Centre."

Friday is Day 35 in the search, and the batteries powering the flight data recorders' locator beacons are certified to emit signals for only 30 days after they get wet.

xes hold the answers and that they will be found soon.

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