(Reuters) - Chipmaker Qualcomm Inc signed a licensing pact with Xiaomi Technology Co Ltd that allows the Chinese smartphone maker to use its patents to make and sell 3G and 4G devices. Xiaomi has enjoyed a rapid rise with handsets it touts as cheaper but well-designed alternatives to Apple Inc's iPhones. Shares of Qualcomm rose 3.6 percent to $51.07 in premarket trading on Wednesday.



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