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David Wichner, Arizona Daily Star Published 7:42 p.m. MT Oct. 12, 2019 CLOSE Raytheon is the Tucson region’s largest employer with about 13,000 employees and an economic impact of about $2 billion. (Photo: Raytheon Missile Systems) Shareholders of Raytheon Co. and United Technologies Corp. on Friday overwhelmingly approved UTC’s acquisition of Raytheon in a deal billed …