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Probe into Boeing's 787 Dreamliners Grows

Matt Hosford/ABC News(TOKYO) -- The investigation into Boeing's troubled 787 Dreamliners now spans three countries.

Japan's transport ministry is investigating a British company that makes the plane's valve actuators.  The National Transportation Safety Board, meanwhile, is inspecting the Arizona-based manufacturer of the jet's lithium-ion battery chargers.

In Kyoto Tuesday, Federal Aviation Administration and Japanese officials continued their probe of the battery maker for a second day.

The NTSB has ruled out an overcharged battery as the cause of the fire on board a Japan Airlines Dreamliner this month.  But the battery remains the focus of a separate investigation into an All Nippon Airways flight that prompted an emergency landing last week.

The conflicting problems have prolonged flight cancellations and grounded dozens of Dreamliners around the world.

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