world exhibition in Paris. The workforce had grown to more than 1,000 workers. In 1870, Switzerland's first company-owned vocational school with training workshops was founded. In 1872, 24 workers' dwellings were built in Winterthur by the “Gesellschaft für Erstellung billiger Wohnhäuser” (Society for Affordable Housing Construction). Further apartment buildings and also private homes followed in other parts of Winterthur. From 1880, steam engines, in particular, contributed to the growth to around 2,000 employees. In 1881 a branch was founded in Ludwigshafen am Rhein, Germany. In 1898, the first Sulzer diesel engine was developed in cooperation with Rudolf Diesel. Around 1900 the company had over 3,000 employees and sales offices in Milan, Paris, Cairo, London, Moscow and Bucharest, from 1914 also in the Japanese city of Kobe. As a family business, the company had grown over the years in the form of a general partnership, and in June 1914 it was converted into two stock corporations with registered offices in Winterthur and Ludwigshafen am Rhein, both of which were renamed Gebrüder Sulzer Aktiengesellschaft. In 1917, both companies were bundled in a holding structure under the name Sulzer-Unternehmungen AG and subsequently the foreign sales offices were also transferred to independent companies. Sulzer initiates Switzerland’s first regularly published in-house magazine in 1919. At the same time, the technical customer magazine “Technische Rundschau Sulzer” (later “Sulzer Technical Review”) was launched. During the 1930s, production fell by two thirds as a result of the global economic crisis, and personnel was massively reduced. World War II Out of political and personal considerations, Sulzer decided to sell its subsidiaries in Germany by the beginning of the war. Sulzer was blacklisted by the Allies during World War II due to an increase in trade with Axis countries. Sulzer refused to sign an agreement to limit the future sale of marine diesel engines to the Axis countries, and was blacklisted by the Allies as a result. Postwar period From 1945, a growth phase began with a flourishing economy and strong expansion of foreign activities. In the 1950s, increasing production was carried out by guest workers, mainly from southern Europe. New divisions for energy, plant engineering and textile machinery were created, accompanied by better working conditions, expansion of social benefits, women's work for "lighter factory work" and housing subsidies in surrounding communities. During the second heyday after the Second World War, the Sulzer Tower was built in the early 1960s