Given the question: Information:  - Germany, officially the Federal Republic of Germany, is a federal parliamentary republic in central-western Europe. It includes 16 constituent states, covers an area of , and has a largely temperate seasonal climate. With about 82 million inhabitants, Germany is the most populous member state of the European Union. After the United States, it is the second most popular immigration destination in the world. Germany's capital and largest metropolis is Berlin. Other major cities include Hamburg, Munich, Cologne, Frankfurt, Stuttgart and Düsseldorf.  - Buick, formally the Buick Motor Division, is an upscale automobile brand of the American manufacturer General Motors (GM). For much of its existence in the North American market, Buick has been marketed as a premium automobile brand, selling luxury vehicles positioned above GM's mainstream brands, e.g. Chevrolet, while below the flagship luxury Cadillac division. Buick-branded vehicles are also known for reliability, ranking in the top ten for reliability in Consumer Reports' brand reliability rankings.  - Wilhelm von Opel (15 May 1871  2 May 1948), known as Wilhelm Opel before being ennobled in 1917, was one of the founders of the German automobile manufacturer Opel. He introduced the assembly line to the German automobily industry.  - Adam Opel (9 May 1837  8 September 1895) was the founder of the German automobile company Adam Opel AG.  - General Motors Company, commonly known as GM, is an American multinational corporation headquartered in Detroit, Michigan, that designs, manufactures, markets, and distributes vehicles and vehicle parts, and sells financial services. The current company, General Motors Company LLC ("new GM"), was formed in 2009 following the bankruptcy of General Motors Corporation ("old GM"), which became Motors Liquidation Company. The new company purchased the majority of the assets of the old GM, including the brand "General Motors".  - China, officially the People's Republic of China (PRC), is a unitary sovereign state in East Asia. With a population of over 1.381 billion, it is the world's most populous country. The state is governed by the Communist Party of China, and its capital is Beijing. It exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities (Beijing, Tianjin, Shanghai, and Chongqing), and two mostly self-governing special administrative regions (Hong Kong and Macau), and claims sovereignty over Taiwan. The country's major urban areas include Shanghai, Guangzhou, Beijing, Chongqing, Shenzhen, Tianjin and Hong Kong. China is a great power and a major regional power within Asia, and has been characterized as a potential superpower.  - Adam Opel AG (Opel) is a German automobile manufacturer headquartered in Rüsselsheim, Hesse, Germany, subsidiary of the American group General Motors. The company designs, engineers, manufactures and distributes Opel-branded passenger vehicles, light commercial vehicles and vehicle parts for distribution in Africa, Asia, Europe and South America. Opel designed and manufactured vehicles are also sold under the Buick brand in the United States, Canada, Mexico, and China, the Holden brand in Australia and New Zealand, and the Vauxhall brand in Great Britain.  - South America is a continent located in the western hemisphere, mostly in the southern hemisphere, with a relatively small portion in the northern hemisphere. It is also considered a subcontinent of the Americas, which is the model used in nations that speak Romance languages. The reference to South America instead of other regions (like Latin America or the Southern Cone) has increased in the last decades due to changing geopolitical dynamics (in particular, the rise of Brazil).  - General Motors Holden, generally known as Holden, is an Australian automobile manufacturer that operates in Australia and is headquartered in Port Melbourne, Victoria. The company was founded in 1856 as a saddlery manufacturer in South Australia. In 1908 it moved into the automotive field, before becoming a subsidiary of the United States-based General Motors (GM) in 1931. After becoming a subsidiary of GM, the company was named General Motors-Holden's Ltd, becoming Holden Ltd in 1998the current name was adopted in 2005.  - Hesse or Hessia (, Hessian dialect: "Hesse" ) is a federal state ("Land") of the Federal Republic of Germany, with just over six million inhabitants. The state capital is Wiesbaden; the largest city is Frankfurt am Main. Until the formation of the German Reich in 1871, Hesse was an independent country ruled by a Grand Duke (Grand Duchy of Hesse). Due to divisions after World War II, the modern federal state does not cover the entire cultural region of Hesse which includes both the State of Hesse and the area known as Rhenish Hesse (Rheinhessen) in the neighbouring state of Rhineland-Palatinate.  - Engineers design materials, structures, and systems while considering the limitations imposed by practicality, regulation, safety, and cost. The word "engineer ("from the Latin "ingeniator"")" is derived from the Latin words "ingeniare" ("to contrive, devise") and "ingenium" ("cleverness"). The foundation education of an engineer is typically a 4-year bachelor's degree or in some countries, a master's degree in an engineering discipline plus 46 years peer-reviewed professional practice culminating in a project report or thesis. Engineers who seek a professional engineer license in N. America will be required to take further exams in ethics, law and professional practice.  - Fritz Adam Hermann von Opel , before 1918 Opel ( 4 May 1899 , Rüsselsheim , Grand Duchy of Hesse - 8 April 1971 ) , was the only child of Wilhelm von Opel and a grandson of Adam Opel , founder of the Opel company . He is remembered mostly for his spectacular demonstrations of rocket propulsion that earned him the nickname `` Rocket Fritz '' . Opel was born in Rüsselsheim and educated at the technical university of Darmstadt . After graduation , he was made director of testing for the Opel company and also put in charge of publicity . In the 1920s , he became interested in using rockets in publicity stunts for the company and sought advice from Max Valier of the newly formed Verein für Raumschiffahrt ( VfR - `` Spaceflight Society '' ) and Friedrich Sander , a pyrotechnics manufacturer from Bremerhaven . On 15 March 1928 Opel tested his first rocket - powered car , the RAK.1 , and achieved a top speed of 75 km / h ( 47 mph ) in it , proving the feasibility of the concept of rocket propulsion . Less than two months later , he reached a speed of 230 km / h ( 143 mph ) in the RAK.2 , driven by 24 solid - fuel rockets . Later that same year , he purchased a sailplane named the `` Lippisch Ente '' ( Ente is `` duck '' in German ) from Alexander Lippisch and attached rocket motors to it , creating the world 's first rocket plane on 11 June . The aircraft exploded on its second test flight , before Opel had had a chance to pilot it himself , so he commissioned a new aircraft , also called the RAK.1 , from Julius Hatry , and flew it at Frankfurt - am - Main on 30 September 1929 . In the meantime , another mishap had claimed the RAK.3 , a rocket - powered railway car powered by 30 solid - fuel rockets which had reached a speed of 254 km / h ( 157 mph ) . Also in 1928 , Opel built and test ran a rocket - powered motorcycle called the Monster . Opel left the family firm and Germany after 1929 . On 25 April 1940 Fritz von Opel was taken off the Italian liner Conte di Savoia by the British authorities at Gibraltar . After...  - Canada (French: ) is a country in the northern half of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering , making it the world's second-largest country by total area and the fourth-largest country by land area. Canada's border with the United States is the world's longest land border. The majority of the country has a cold or severely cold winter climate, but southerly areas are warm in summer. Canada is sparsely populated, the majority of its land territory being dominated by forest and tundra and the Rocky Mountains. About four-fifths of the country's population of 36 million people is urbanized and live near the southern border. Its capital is Ottawa, its largest city is Toronto; other major urban areas include Montreal, Vancouver, Calgary, Edmonton, Quebec City, Winnipeg and Hamilton.    Given the information, choose the subject and object entities that have the relation of 'occupation'.
The answer is:
fritz von opel , engineer