mechanics industry was the most dominant. Through the years leading up to World War I the country became the 4th biggest machine manufacturer in the world. The two most important trading partners were traditionally Germany (1910: 48% of all exports, 39% of all imports), and Great Britain (1910: almost 10% of all exports, 8% of all imports), the third most important partner was the United States, it followed by Russia, France, Switzerland, Romania, the Balkan states and South America. Trade with the geographically neighbouring Russia, however, had a relatively low weight (1910: 3% of all exports /mainly machinery for Russia, 7% of all imports /mainly raw materials from Russia). Automotive industry Prior to World War I, the Austrian Empire had five car manufacturer companies. These were: Austro-Daimler in Wiener-Neustadt (cars trucks, buses), Gräf & Stift in Vienna (cars), Laurin & Klement in Mladá Boleslav (motorcycles, cars), Nesselsdorfer in Nesselsdorf (Kopřivnice), Moravia (automobiles), and Lohner-Werke in Vienna (cars). Austrian car production started in 1897. Prior to World War I, the Kingdom of Hungary had four car manufacturer companies. These were: the Ganz company in Budapest, RÁBA Automobile in Győr, MÁG (later Magomobil) in Budapest, and MARTA (Hungarian Automobile Joint-stock Company Arad) in Arad. Hungarian car production started in 1900. Automotive factories in the Kingdom of Hungary manufactured motorcycles, cars, taxicabs, trucks and buses. Electrical industry and electronics In 1884, Károly Zipernowsky, Ottó Bláthy and Miksa Déri (ZBD), three engineers associated with the Ganz Works of Budapest, determined that open-core devices were impractical, as they were incapable of reliably regulating voltage. When employed in parallel connected electric distribution systems, closed-core transformers finally made it technically and economically feasible to provide electric power for lighting in homes, businesses and public spaces. The other essential milestone was the introduction of 'voltage source, voltage intensive' (VSVI) systems' by the invention of constant voltage generators in 1885. Bláthy had suggested the use of closed cores, Zipernowsky had suggested the use of parallel shunt connections, and Déri had performed the experiments; The first Hungarian water turbine was designed by the engineers of the Ganz Works in 1866, the mass production with dynamo generators started in 1883. The manufacturing of steam turbo generators started in the Ganz Works in 1903. In 1905, the Láng Machine Factory company also started the production of steam turbines for alternators. Tungsram is a Hungarian manufacturer of light bulbs and vacuum tubes since