1907 DMG provided Maybach designed engines to Zeppelin. Wilhelm Maybach quit DMG in 1909. After 1909 Maybach and his son Karl founded their own enterprise in Württemberg and took over supplying the engines. During the First World War, from 1915 the Sindelfingen factory produced large numbers of winged aircraft and aircraft engines. Production was prohibited after the conflict under conditions laid down by the Treaty of Versailles. Aircraft Daimler D.I Daimler G.I Daimler L11 Daimler L14 Three-pointed star: land, water and air In the 1870s, while working for Otto at Deutz AG Gasmotorenfabrik in Cologne, Daimler sent his wife Emma Kunz a postcard, marking his residence with a three-pointed star and writing: "one day this star will shine over our triumphant factories". Since then, this line has inspired both Daimler and Maybach when developing light and powerful engines for "land, water, and air". In the 1900s, after the Mercedes' success, DMG was still lacking a trademark. Paul and Adolf Daimler, the sons of Gottlieb (who had died in early March 1900), suggested using that symbol. Daimler Motoren Gesellschaft's board accepted the proposal in June 1909, also registering a four-pointed one. The four-pointed star became the emblem of Deutsche Aerospace AG (DASA) in the 1980s and then the logo of the European Aeronautic Defence and Space Company (EADS). The three-pointed star debuted in 1910. In 1916, it was surrounded by a circle with four additional stars, with either the name Mercedes or of the respective factory (Untertürkheim or Berlin-Marienfelde). In 1937, the familiar symbol was registered by Daimler-Benz, a three-dimensional three-pointed star, contained in a circle. German crisis (1920s) DMG was one of the most important German businesses at the time of the German crisis; tripling its capital to 100 million shares in 1920, and moving its headquarters to Berlin in 1922. After the war the German automobile industry stagnated because of insufficient demand and because automobiles were taxed by the government as luxury items. The country also was hit by a petrol shortage. In 1923, DMG production fell to 1,020 units, compared to Benz & Cie. making 1,382 in Mannheim. The average cost of a car was 25 million marks. Strike action and inflation pushed DMG to the limit. To survive DMG produced Mercedes bicycles and typewriters, and it even issued its own emergency money. Daimler-Benz and the Mercedes-Benz brand (1926) For the two separate businesses to survive the financial