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Tim Cook, chief executive officer of Apple Inc., speaks with attendees during an event in San Francisco, California, U.S., on Wednesday, Sept. 7, 2016. Apple Inc. unveiled new iPhone models Wednesday, featuring a water-resistant design, upgraded camera system and faster processor, betting that after six annual iterations it can still make improvements enticing enough to lure buyers to their next upgrade. Photographer: David Paul Morris/Bloomberg via Getty Images

Tim Cook, chief executive officer of Apple Inc., speaks with attendees during an event in San Francisco, California, U.S., on Wednesday, Sept. 7, 2016. Apple Inc. unveiled new iPhone models Wednesday, featuring a water-resistant design, upgraded camera system and faster processor, betting that after six annual iterations it can still make improvements enticing enough to lure buyers to their next upgrade. Photographer: David Paul Morris/Bloomberg via Getty Images