Question: In January 2016  Precision Castparts Corp. became a sibsidiary of a multinational conglomerate holding company headquartered where?

full_context: Document 1: United Continental Holdings: United Continental Holdings, Inc. (formerly UAL Corporation) is a publicly traded airline holding company headquartered in the Willis Tower in Chicago. UCH owns and operates United Airlines, Inc. The company is the successor of UAL Corporation, which agreed to change its name to United Continental Holdings in May 2010, when a merger agreement was reached between United and Continental Airlines. Its stock trades under the UAL symbol. To effect the merger, Continental shareholders received 1.05 shares of UAL stock for each Continental share, effectively meaning Continental was acquired by UAL Corporation; at the time of closing, it was estimated that United shareholders owned 55% of the merged entity and Continental shareholders owned 45%. The company or its subsidiary airlines also have several other subsidiaries. Once completely combined, United became the world's largest airline, as measured by revenue passenger miles. United is a founding member of the Star Alliance.
Document 2: Aerospace industry in the United Kingdom: The aerospace industry of the United Kingdom is the fourth-largest national aerospace industry in the world and the third largest in Europe, with a global market share of 6.4% in 2016. In 2013, the industry employed 84,000 people. Domestic companies with a large presence in the British aerospace industry include BAE Systems (the world's third-largest defence contractor), Britten-Norman, Cobham, GKN, Hybrid Air Vehicles, Meggitt, QinetiQ, Rolls Royce (the world's second-largest maker of defence aero engines) and Ultra Electronics. Foreign companies with a major presence include Boeing, Bombardier, Airbus (including its Astrium, Cassidian and Surrey Satellite Technology subsidiaries), Leonardo (including its AgustaWestland and Selex ES subsidiaries), General Electric (including its GE Aviation Systems subsidiary), Lockheed Martin, MBDA (37.5% owned by BAE Systems), Safran (including its Messier-Dowty and Turbomeca subsidiaries) and Thales Group (including its UK-based Thales Air Defence, Thales Avionics and Thales Optronics subsidiaries). Current manned aircraft in which the British aerospace industry has a major role include the AgustaWestland AW101, AgustaWestland AW159, Airbus A320 family, Airbus A330, Airbus A340, Airbus A380, Airbus A400M, BAE Hawk, Boeing 767, Boeing 777, Boeing 787, Bombardier CRJ700, Bombardier CSeries, Bombardier Learjet 85, Britten-Norman Defender, Britten-Norman Islander, Eurofighter Typhoon, Hawker 800, Lockheed Martin C-130J Super Hercules and Lockheed Martin F-35 Lightning II. Current unmanned aerial vehicles in which the British aerospace industry has a major role include BAE Taranis, HAV 304 Airlander 10, QinetiQ Zephyr and Watchkeeper WK450.
Document 3: Wyman-Gordon: Wyman-Gordon is a company that designs and manufactures complex metal components. Founded in 1883 as a manufacturer of crankshafts for looms, it has a long history of making forged metal components, particularly for the aerospace industry. Wyman-Gordon is now a subsidiary of Precision Castparts Corp., and is based in Houston, Texas. It has 13 plants in five countries, and employed about 2,500 people as of 2012.
Document 4: Berkshire Hathaway: Berkshire Hathaway Inc. is an American multinational conglomerate holding company headquartered in Omaha, Nebraska, United States. The company wholly owns GEICO, Long & Foster, BNSF Railway, Lubrizol, Fruit of the Loom, Helzberg Diamonds, FlightSafety International, Pampered Chef, and NetJets, and also owns 26.7% of the Kraft Heinz Company, and significant minority holdings in American Express (17.15%), The Coca-Cola Company (9.4%), Wells Fargo (9.9%), IBM (6.9%) and Apple (2.5%). Since 2016, the company has acquired large holdings in the major US airline carriers and is currently the largest shareholder in United Airlines and Delta Air Lines and a top 3 shareholder in Southwest Airlines and American Airlines. Berkshire Hathaway has averaged an annual growth in book value of 19.0% to its shareholders since 1965 (compared to 9.7% from the S&P 500 with dividends included for the same period), while employing large amounts of capital, and minimal debt.
Document 5: Boeing Aircraft Holding Company: Boeing Aircraft Holding Company (BAHC) is a wholly owned subsidiary of Boeing. This company manages Boeing-owned, used aircraft, including planes acquired due to a trade-in or a lease return. It has a mailing address in Seattle, Washington, near the headquarters for Boeing Commercial Airplanes, but the point of location is listed as Delaware.
Document 6: Precision Castparts Corp.: Precision Castparts Corp. is an American industrial goods and metal fabrication company that manufactures investment castings, forged components, and airfoil castings for use in the aerospace, industrial gas turbine, and defense industries. In 2009 it ranked 362nd on the Fortune 500 list, and 11th in the aerospace and defense industry. In 2015 it ranked 322nd overall and 9th in the aerospace and defense industry. In 2014 it ranked 133rd on the S&P 500 based on market capitalization. In January 2016, the company became a subsidiary of Berkshire Hathaway. Before that event, it used to be one of the three Fortune 500 companies headquartered in Oregon.
Document 7: United Airlines: United Airlines, Inc., commonly referred to as United, is a major U.S. airline headquartered in Chicago, Illinois. It is the world's third-largest airline when measured by revenue, after American Airlines and Delta Air Lines. United operates a large domestic and international route network, with an extensive presence in the Asia-Pacific region. United is a founding member of Star Alliance, the world's largest airline alliance. Regional service is operated by independent carriers under the brand name United Express. Its main competitors are American Airlines, Delta Air Lines, and Southwest Airlines.
Document 8: International Association of Machinists and Aerospace Workers: International Association of Machinists and Aerospace Workers
Document 9: American Airlines Group: American Airlines Group, Inc. is an American publicly traded airline holding company headquartered in Fort Worth, Texas. It was formed December 9, 2013, in the merger of AMR Corporation, the parent company of American Airlines, and US Airways Group, the parent company of US Airways. The airline groups together form the largest airline in the world, with more than 6,700 daily flights to 336 locations in 56 countries worldwide, about $40 billion in operating revenue, over 100,000 employees, and plans to take delivery of 607 new aircraft, including 517 narrowbody aircraft and 90 widebody international aircraft. The integration of American Airlines and US Airways was completed when the Federal Aviation Administration granted a single operating certificate for both carriers on April 8, 2015.
Document 10: PPG Industries: PPG Industries, Inc. is an American Fortune 500 company and global supplier of paints, coatings, specialty materials, and fiberglass. With headquarters in Pittsburgh, Pennsylvania, PPG operates in more than 70 countries around the globe. By revenue it is the largest coatings company in the world. It is headquartered in PPG Place, an office and retail complex in downtown Pittsburgh, and is known for its glass facade designed by Philip Johnson.
Document 11: 3G Capital: 3G Capital is an American/Brazilian multibillion-dollar investment firm, founded in 2004 by principals Jorge Paulo Lemann, Carlos Alberto Sicupira, Marcel Herrmann Telles and Roberto Thompson Motta. The firm is best known for partnering up with Berkshire Hathaway for its acquisitions, including those of Burger King, Tim Hortons, Heinz and Kraft Foods.
Document 12: Leonardo S.p.A.: Leonardo S.p.A., formerly Leonardo-Finmeccanica and Finmeccanica, is an Italian global high-tech company and one of the key players in aerospace, defence and security. Headquartered in Rome, the company has 180 sites worldwide. It is the ninth largest defence contractor in the world based on 2014 revenues. The company is partially owned by the Italian government through the Ministry of Economy and Finance, which holds 30.2% of the company's shares and is its largest shareholder.
Document 13: Titanium Metals Corporation: Titanium Metals Corporation, founded in 1950, is an American manufacturer of titanium-based metals products, focusing primarily on the aerospace industry. In November 2012, it was announced the company was being purchased for $2.9 billion by Precision Castparts Corp.
Document 14: Warren Buffett: Warren Edward Buffett ( ; born August 30, 1930) is an American business magnate, investor, and philanthropist. Buffett serves as the Chief Executive Officer and Chairman of Berkshire Hathaway. He is considered by some to be one of the most successful investors in the world, and as of August 2017 is the second wealthiest person in the United States, and the fourth wealthiest in the world, with a total net worth of $76.9 billion.
Document 15: Kaiser Aluminum: Kaiser Aluminum an American aluminum producer is a spinoff from Kaiser Aluminum and Chemicals Corporation which came to be when common stock was offered in Permanente Metals Corporation and Permanente Metals Corporation's name was changed to Kaiser Aluminum and Chemicals Corporation. Henry J. Kaiser's corporation entered the aluminum business by leasing, then purchasing three government-owned aluminum facilities in Washington state. These were the primary reduction plants at Mead and Tacoma, and the rolling mill at Trentwood. The company grew to be a vertically integrated aluminum producer. Kaiser currently owns 12 fabricating plants that can produce more than 400000000 lbs of aluminum annually. The company also owns a 49 percent interest in an aluminum smelter in Wales. The North American plants produce approximately 500000000 lbs per year of value-added sheet, plate, extrusions, forgings, rod, bar, and tube. Kaiser previously owned a subsidiary that developed real estate, including Rancho California, California.
ground_truth: Omaha, Nebraska, United States