By Deepa Seetharaman SEATTLE (Reuters) - Amazon.com Inc's newest mobile device, a smartphone that may sport a 3D screen, is the retailer's latest attempt to exert its influence over the way consumers shop online. Chief Executive Officer Jeff Bezos will preside over a mystery launch on Wednesday near its Seattle campus. Industry observers predict the arrival of a long-rumored smartphone after years of development. It is unclear if a 3D display, as widely reported, is enough to help the new entree stand out in a crowded field dominated by Apple Inc's seven-year-old iPhone and Samsung Electronics Co Ltd Galaxy devices.



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