Oct 23 (Reuters) - United Technologies Corp said on a conference call on Tuesday it expects tariffs to cost about $200 million in 2019, double its prior estimate of about $100 million. The shares of the U.S. aerospace and industrial company fell 1.7 percent in premarket trading. (Reporting by Ankit Ajmera and Soundarya J in Bengaluru; Editing by Arun Koyyur)
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