Please answer the following question: Information: - Mercedes-Benz is a global automobile manufacturer and a division of the German company Daimler AG. The brand is known for luxury vehicles, buses, coaches, and trucks. The headquarters of Mercedes-Benz are in Stuttgart, Baden-Wurttemberg, Germany. - Baden-Wurttemberg is a state in Germany located in the southwest, east of the Upper Rhine. It is Germanys third largest state in terms of size and population, with an area of and 10.8million inhabitants. The state capital and largest city is Stuttgart. - Luxury vehicle is a marketing term for a vehicle that provides luxury pleasant or desirable features beyond strict necessity at increased expense (see luxury goods). - Daimler AG is a German multinational automotive corporation. Daimler AG is headquartered in Stuttgart, Baden-Wurttemberg, Germany. As of 2014, Daimler owns or has shares in a number of car, bus, truck and motorcycle brands including Mercedes-Benz, Mercedes-AMG, Smart Automobile, Freightliner, Western Star, Thomas Built Buses, Setra, BharatBenz, Mitsubishi Fuso, MV Agusta as well as shares in Denza, KAMAZ, Beijing Automotive Group. The Maybach brand was closed at the end of 2012, but was revived in April 2015 as "Mercedes-Maybach", an ultra luxury edition of the Mercedes-Benz S-Class. In 2015 Daimler sold 2.9 million vehicles. By unit sales, Daimler is the thirteenth-largest car manufacturer and second-largest truck manufacturer in the world. In addition to automobiles, Daimler manufactures buses and provides financial services through its Daimler Financial Services arm. The company is a component of the Euro Stoxx 50 stock market index. - The Mercedes - Benz 4G - Tronic transmission was produced from 1981 to 1996 in 722.3 and 722.4 variants . It was a hydraulically operated non-lockup four speed automatic that replaced the similarly designed 722.2 four speed automatic transmisison in 1981 . The 4G - Tronic was used until mid- 1996 in some vehicles when it was replaced by the Mercedes - Benz 722.5 which is basically the same transmission with an additional electrically controlled 5th gear for overdrive . This was in turn replaced with the more modern 722.6 5G - Tronic transmission that features a torque converter lockup and fully electronic control . - Stuttgart ( Swabian: "Schduagert"), often nicknamed the ""Schwabenmetropole"" in reference to its location in the center of Swabia and the local dialect spoken by some natives, is the capital and largest city of the German state of Baden-Wurttemberg. It is located on the Neckar river in a fertile valley locally known as the "Stuttgarter Kessel" an hour from the Swabian Jura and the Black Forest. Stuttgart's name comes from the Old High German word ""Stuogarten"," or "stud farm" a reference to the city's founding in 950 AD as a stud farm. Stuttgarts urban area has a population of 623,738, and a further making it the sixth largest city in Germany, 2.7million people live in the citys administrative region, and another 5.3million people in its metropolitan area, making it the fourth largest metropolitan area in Germany. What is the relationship between 'mercedes-benz 4g-tronic transmission' and 'automobile'?
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subclass of