Question: In which year did the manufacturer of the Nord 1500 Griffon end?

full_context: Document 1: SS.11: SS.11 is the designation of the Nord Aviation MCLOS wire-guided anti-tank missile. In American service, the missile was designated the "AGM-22". The missile entered service with the French Army in 1956. Production of the SS.11/SS.12 series ceased some time in the 1980s, by which time over 170,000 had been sold. The price of the SS.11 in the late 1960s was stated at approximately $1,900 U.S. dollars.
Document 2: Griffon-GRSE 8000 TD-Class Hovercraft: Griffon/GRSE 8000 TD class is a series of hovercraft designed by M/s Griffon Hovercraft Ltd, Southampton, England and jointly built by Garden Reach Shipbuilders & Engineers, Kolkata and Griffon for the Indian Coast Guard.
Document 3: ANF Industrie: Ateliers de Construction du Nord de la France was a French locomotive manufacturer, based at Crespin in the Arrondissement of Valenciennes, northern France. Later known as ANF Industrie or ANF the company was acquired by Bombardier Transportation in 1989 and is now part of Bombardier Transport France S.A.S.
Document 4: Grumman: During World War II, Grumman became known for its "Cats", Navy fighter aircraft, F4F Wildcat and F6F Hellcat, and the less well known Grumman F7F Tigercat and Grumman F8F Bearcat (neither of which saw combat during World War II), and for its torpedo bomber TBF Avenger. Grumman ranked 22nd among United States corporations in the value of wartime production contracts. Grumman's first jet aircraft was the F9F Panther; it was followed by the upgraded F9F/F-9 Cougar, and the less well known F-11 Tiger in the 1950s. The company's big postwar successes came in the 1960s with the A-6 Intruder and E-2 Hawkeye and in the 1970s with the Grumman EA-6B Prowler and F-14 Tomcat. Grumman products were prominent in the films The Final Countdown, Top Gun and numerous World War II naval and Marine Corps aviation films. The U.S. Navy still employs the Hawkeye as part of Carrier Air Wings on board aircraft carriers, while the U.S. Marine Corps, the last branch of service to fly the Prowler retired it on March 8, 2019.
Document 5: Nord Aviation: The company was based in the centre of France, on the site of Bourges airport, in the département of Cher. In 1970, Nord Aviation merged with Sud Aviation to create "Société nationale d'industrie aérospatiale" (SNIAS), later renamed Aérospatiale and ultimately merged into European aerospace corporation Airbus in 2000.
Document 6: Nordic Airways: Nordic Airways was an airline based in Stockholm, Sweden. It operated extensive charter and wet lease services. The company's low-cost airline subsidiary Nordic Regional also operates a scheduled network of services linking five domestic and one international destination. Its main base was Stockholm-Arlanda Airport.
Document 7: Sabena: The Societé Anonyme Belge d'Exploitation de la Navigation Aérienne (French; "Belgian Corporation for Air Navigation Services"), better known internationally by the acronym Sabena or SABENA, was the national airline of Belgium from 1923 to 2001, with its base at Brussels National Airport. After its bankruptcy in 2001, the newly formed SN Brussels Airlines took over part of Sabena's assets in February 2002, which became Brussels Airlines after a merger with Virgin Express in March 2007. The airline's corporate headquarters were located in the Sabena House on the grounds of Brussels Airport in Zaventem.
Document 8: Dassault Aviation: Dassault Aviation SA () is an international French aircraft manufacturer of military, regional, and business jets, and is a subsidiary of Dassault Group.
Document 9: Entwicklungsring Nord: West Germany provided 53.3% of Spacelab's cost and fulfilled 52.6% of all Spacelab work contracts. ERNO VFW Fokker, in competition with MBB, submitted the winning design, and became the prime contractor for Spacelab. MBB in 1981 took over VFW Fokker. The ERNO plant in Bremen continued as the headquarters for Spacelab design, production management, component testing, and assembly. It became a part of EADS Astrium Space Transportation, then Airbus Defence and Space, then Airbus Safran Launchers, and now ArianeGroup.
Document 10: British Aerospace: The GEC merger to create a UK company compared to what would have been an Anglo-German firm, made the possibility of further penetration of the United States (US) defence market more likely. The company, initially called "New British Aerospace", was officially formed on 30 November 1999 and known as BAE Systems.
Document 11: Paris: Orly Airport, located in the southern suburbs of Paris, replaced Le Bourget as the principal airport of Paris from the 1950s to the 1980s. Charles de Gaulle Airport, located on the edge of the northern suburbs of Paris, opened to commercial traffic in 1974 and became the busiest Parisian airport in 1993. Today it is the 4th busiest airport in the world by international traffic, and is the hub for the nation's flag carrier Air France.  Beauvais-Tillé Airport, located 69 km (43 mi) north of Paris' city centre, is used by charter airlines and low-cost carriers such as Ryanair.
Document 12: Scottish Aviation: In November 1958, redundancies affecting almost 800 of their 2,500 staff were announced. Scottish Aviation merged with the British Aircraft Corporation, Hawker Siddeley Aviation, and Hawker Siddeley Dynamics to form British Aerospace in 1977. Much of the former Scottish Aviation assets now belong to Spirit AeroSystems.
Document 13: Nord 1500 Griffon: The Nord 1500 Griffon was an experimental ramjet-powered fighter aircraft designed and built in the mid-1950s by French state-owned aircraft manufacturer Nord Aviation. It was part of a series of competing programs to fill a French Air Force specification for a Mach 2 fighter.
Document 14: North American A-5 Vigilante: The North American A-5 Vigilante is an American carrier-based supersonic bomber designed and built by North American Aviation for the United States Navy. It set several world records including long distance speed and altitude records. Its service in the nuclear strike role to replace the Douglas A-3 Skywarrior was very short; however, as the RA-5C, it saw extensive service during the Vietnam War in the tactical strike reconnaissance role. Prior to the unification of the Navy designation sequence with the Air Force sequence in 1962, it was designated the A3J Vigilante.
Document 15: AA.20: The AA.20 was a French air-to-air missile, developed by Nord Aviation, and was one of the first of such missiles adopted into service in Western Europe. Production began at Chatillon, France in 1956. Approximately 6,000 missiles of the type were produced, remaining in service until 1960.
ground_truth: 1970
sub_queries: Nord 1500 Griffon >> manufacturer Answer: Nord Aviation
Which year did Nord Aviation end? Answer: 1970