In this Feb. 13, 2015, file photo, a sign warns employees to stay away from an area where KIVA robotic transport units are in motion, during a media tour of the new Amazon fulfillment center in DuPont, Wash. The center is one of 50 around the country and three in the Puget Sound area that process and ship Amazon customer orders using a mix of robotic technology and human employees. Photo: AP Photo/Ted S. Warren, File   / AP
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