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United Technologies Corporation was incorporated in Delaware in 1934. UTC provides high technology products and services to the building systems and aerospace industries worldwide. Growth is attributable primarily to the internal development of our existing businesses and to acquisitions. The following description of our business should be read in conjunction with "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our 2019 Annual Report, including the information contained therein under the heading "Business Overview." Our operations for the periods presented herein are classified into four segments: Otis, Carrier, Pratt & Whitney, and Collins Aerospace Systems, with each segment comprised of groups of similar operating companies. References to each segment include the various operating companies established worldwide through which the operations for each segment are conducted. Otis and Carrier (collectively referred to as the "commercial businesses") serve customers in the commercial, government, infrastructure and residential property sectors, and refrigeration and transport sectors worldwide. Pratt & Whitney and Collins Aerospace Systems (collectively referred to as the "aerospace businesses") primarily serve commercial and government customers in both the original equipment and aftermarket parts and services markets of the aerospace industry. For 2019, our commercial and industrial sales (generated principally by the commercial businesses) were approximately 41 percent of our consolidated sales, and our commercial and military aerospace sales (generated exclusively by our aerospace businesses) were approximately 42 percent and 17 percent, respectively, of our consolidated sales. International sales for 2019, including U.S. export sales, were 60 percent of our net sales.
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