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(Reuters) - Sprint Corp (NYS:S) said on Wednesday it has demonstrated ultra-fast wireless data speeds of 1 gigabits per second, about 16 times faster than its current peak speeds and rivaling the fastest wireline speeds. After losing subscribers for years, the No. 3 U.S. mobile service provider, is looking to distinguish itself from rivals AT&T Inc (NYS:T), Verizon Wireless (NYS:VZ - News)(LSE ...