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Apple Sapphire Supplier GT Advanced Files for Bankruptcy

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GT Advanced Technologies Inc., a parts supplier for Apple Inc., filed for bankruptcy, showing a partnership with the iPhone maker couldn’t assure success for its business of manufacturing lab-grown sapphire used to make mobile-device screens sturdier.

Apple last November signed a deal to make a prepayment of about $578 million to GT Advanced to build furnaces used to make synthetic sapphire. When Apple introduced new iPhones last month though, the smartphones didn’t include the material.