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(CNN) – Searchers say pulse signals detected in the Indian Ocean provide the best hope so far for finding Malaysia Airlines Flight 370.
Separate pings were detected by an Australian ship and a Chinese ship. But the pings detected by Australia's ship were at a lower frequency than the standard for flight data and cockpit voice recorders' pingers.
Meanwhile, the reliability of the information from the Chinese ship is in doubt for many reasons.
So is hope fading yet again?
Thomas Altshuler, vice president of Teledyne Marine Systems Thomas Altshuler, the company that manufactures the ping detection equipment on the Chinese ship, and Chris Portale, director of Dukane Seacom, the pinger manufacturer discuss.
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