paragraph_text: Datsun (, ) is an automobile brand owned by Nissan. Datsun's original production run began in 1931. From 1958 to 1986, only vehicles exported by Nissan were identified as Datsun. By 1986 Nissan had phased out the Datsun name, but re-launched it in June 2013 as the brand for low-cost vehicles manufactured for emerging markets.

paragraph_text: Scion is a discontinued marque of Toyota that started in 2003. It was designed as an extension of its efforts to appeal towards younger customers. The Scion brand primarily featured sports compact vehicles (primarily badge engineered from Toyota's international models), a simplified "pure price" model, and eschewed trim levels in favor of offering a single trim for each vehicle with a range of factory and aftermarket options for buyers to choose from to personalize their vehicle. The "Scion" name, meaning the descendant of a family or heir, refers both to the brand's cars and their owners. The brand first soft launched in the United States at selected Toyota dealers in the state of California in June 2003, before expanding nationwide by February 2004. In 2010, Scion expanded into Canada. In an effort to target the generation Y demographic, Scion primarily relied on guerrilla and viral marketing techniques.

paragraph_text: Norfolk Assembly was a Ford manufacturing plant that opened on April 20, 1925 on the Elizabeth River, near downtown Norfolk, Virginia -- closing in 2007.

paragraph_text: The Ford Motor Company Edgewater Assembly Plant was located in Edgewater, Bergen County, New Jersey, United States. The factory began operations in 1930 and was closed in 1955, having been replaced by the Mahwah Assembly plant. The building was built in 1929 and added to the National Register of Historic Places on September 15, 1983, located at 309 River Road. The building was torn down in 2006 and replaced with a residential development.

paragraph_text: Ford South Africa was based in Port Elizabeth (now part of the Eastern Cape province) and had been operating since 1923. In the early 1980s, it had both a vehicle assembly plant and an engine plant in Struandale, together with an older assembly plant in Neave. After the merger with Sigma and the formation of Samcor, the engine plant continued to be operated by Samcor and in 2015 is still operating under Ford ownership. Both the assembly plants were closed and all vehicle production transferred to Samcor's Silverton Assembly Plant in Pretoria. The Struandale assembly plant was subsequently sold to Delta Motor Corporation (General Motors).

paragraph_text: The first underground line opened on October 27, 1904, almost 35 years after the opening of the first elevated line in New York City, which became the IRT Ninth Avenue Line. By the time the first subway opened, the lines had been consolidated into two privately owned systems, the Brooklyn Rapid Transit Company (BRT, later Brooklyn -- Manhattan Transit Corporation, BMT) and the Interborough Rapid Transit Company (IRT). Many present lines were built under the Dual Contracts, and after 1913, all lines built for the IRT and most other lines built or improved for the BRT were built by the city and leased to the companies. The first line of the city - owned and operated Independent Subway System (IND) opened in 1932; this system was intended to compete with the private systems and allow some of the elevated railways to be torn down, but kept within the core of the City due to the low amount of startup capital provided to the municipal Board of Transportation, the later MTA, by the state. This required it to be run ``at cost '', necessitating fares up to double the five - cent fare popular at the time.

paragraph_text: The first underground line opened on October 27, 1904, almost 35 years after the opening of the first elevated line in New York City, which became the IRT Ninth Avenue Line. By the time the first subway opened, the lines had been consolidated into two privately owned systems, the Brooklyn Rapid Transit Company (BRT, later Brooklyn -- Manhattan Transit Corporation, BMT) and the Interborough Rapid Transit Company (IRT). Many present lines were built under the Dual Contracts, and after 1913, all lines built for the IRT and most other lines built or improved for the BRT were built by the city and leased to the companies. The first line of the city - owned and operated Independent Subway System (IND) opened in 1932; this system was intended to compete with the private systems and allow some of the elevated railways to be torn down. However, it was kept within the core of the city because of the low amount of startup capital provided to the municipal Board of Transportation by the state. This required it to be run ``at cost '', necessitating fares up to double the five - cent fare popular at the time.

paragraph_text: VTEC (Variable Valve Timing & Lift Electronic Control) is a system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine, resulting in higher performance at high RPM, and lower fuel consumption at low RPM. The VTEC system uses two (or occasionally three) camshaft profiles and hydraulically selects between profiles. It was invented by Honda engineer Ikuo Kajitani. It is distinctly different from standard VVT (variable valve timing) systems which change only the valve timings and do not change the camshaft profile or valve lift in any way.

paragraph_text: The Short S.16 Scion and Scion II were 1930s British two-engine, cantilever monoplanes built by Short Brothers and (under licence) by Pobjoy Airmotors and Aircraft Ltd. in Rochester, Kent between 1933 and 1937. Altogether 22 Scion/Scion II aircraft were built and they provided useful service to operators working from small airstrips/water courses in many parts of the globe, including Europe, the Near and Middle East, Sierra Leone, Papua New Guinea and Australia. Many were impressed into the RAF during the Second World War, providing pilot ferry services, anti-aircraft co-operation and radar calibration duties. Of the civilian Scions, at least two were still operating in Australia in 1966, one having been re-engined with de Havilland Gipsy Minor engines.

paragraph_text: The American Thermos Bottle Company Laurel Hill Plant, located in the Laurel Hill section of Norwich, Connecticut, in the United States, includes 11 contributing buildings and two other contributing structures. The original plant was built during 1912–13 and used a historic Italianate house as a company office building. The plant was the primary factory where Thermos brand vacuum flask bottles were manufactured from 1913 to 1984. The plant is historically significant to its connection to the Thermos Company and the history of Norwich. The complex is architecturally significant because it displays the adaptive use of industrial mill design to new industry. It was added to the National Register of Historic Places in 1989.

paragraph_text: The Nissan Fuga (Japanese: 日産・フーガ "Nissan Fūga") is a mid-size luxury sedan produced by Japanese automaker Nissan since October 2004. It is built on a wider, stretched wheelbase version of the Nissan FM platform. After the Nissan Cima and Nissan President were discontinued in August 2010, the Fuga became Nissan's flagship vehicle. In North America and Europe, the Fuga is sold as the second and third-generation Infiniti M (Q70 from 2014), where it has been the flagship of the Infiniti luxury division of Nissan since 2006.

paragraph_text: Ukrhydroenerho or "UkrHydroEnergy" () is a state company of Ukraine that administers a cascade of major hydro power plants along Dnieper and Dniester rivers. The company is owned by the Energy Company of Ukraine.

paragraph_text: The Mercedes-Benz T2 was a transporter manufactured by Daimler-Benz. The T2 is also known as the "Düsseldorf transporter", since it was built in Düsseldorf from 1967 on. The third series, built from 1996 at Ludwigsfelde, was branded the Mercedes-Benz Vario. Some T2s were assembled by Mercedes-Benz España in their Alcobendas assembly plant.

paragraph_text: Seattle remained the corporate headquarters of Boeing until 2001, when the company separated its headquarters from its major production facilities; the headquarters were moved to Chicago. The Seattle area is still home to Boeing's Renton narrow-body plant (where the 707, 720, 727, and 757 were assembled, and the 737 is assembled today) and Everett wide-body plant (assembly plant for the 747, 767, 777, and 787). The company's credit union for employees, BECU, remains based in the Seattle area, though it is now open to all residents of Washington.

paragraph_text: The Jonga was a Nissan designed vehicle used by the Indian Army. Jonga was an acronym for Jabalpur Ordnance aNd Guncarriage Assembly.

paragraph_text: The Scion bbX was first concept car to be revealed by Toyota for its daughter company, Scion. The concept was first shown at the New York International Auto Show in 2003. As shown at the motor show, the bbX is very similar to the design of the Scion xB, sold for two generations from 2003 to 2015.

paragraph_text: Janesville Assembly Plant is a former automobile factory owned by General Motors located in Janesville, Wisconsin. Opened in 1919, it was the oldest operating GM plant when it was largely idled in December 2008, and ceased all remaining production on April 23, 2009. The demolition of the plant began in April 2018.

paragraph_text: The Scion Fuse is a concept car created under one of Toyota's brands, Scion. The Fuse was built by Five Axis Models in Huntington Beach, CA with assistance from MillenWorks. It was first introduced at the 2006 New York International Auto Show. According to Scion, the Fuse is a 2-door coupe with 4 seats and swan doors for clearer ground clearance.

paragraph_text: By the early 1960s, the US had begun placing stiff import tariffs on certain vehicles. The so - called ``chicken tax ''of 1964 placed a 25% tax on imported light trucks. In response to the tariff, Toyota, Nissan Motor Co. and Honda Motor Co. began building plants in the US by the early 1980s.

paragraph_text: Some buyers lamented the small size of the first Japanese compacts, and both Toyota and Nissan (then known as Datsun) introduced larger cars such as the Toyota Corona Mark II, the Toyota Cressida, the Mazda 616 and Datsun 810, which added passenger space and amenities such as air conditioning, power steering, AM-FM radios, and even power windows and central locking without increasing the price of the vehicle. A decade after the 1973 oil crisis, Honda, Toyota and Nissan, affected by the 1981 voluntary export restraints, opened US assembly plants and established their luxury divisions (Acura, Lexus and Infiniti, respectively) to distinguish themselves from their mass-market brands.

Question: When did the company that built VTEC, the owner of Scion, and Nissan open US Assembly plants?
Answer: 1981