By 1926 the German Dornier works at Manzel had become too small, and the main factory was transferred to Altenrhein, in Switzerland. Here, for the next three years, Aktien Gesellschaft far Dornier Flugzeug was occupied in building three Do X flying-boats, the largest aircraft of their time, powered by 12 engines. Two were sold to Italy. Bomber designs followed, the Do N, P, and Y being built 1929-1931. These led to the Do F which, like the Do 11, began in 1933 to reequip the German Air Force. However, in 1932 production was resumed in Germany. The Swiss factory subsequently became the Eidgenossisches Flugzeugwerk (q.v.).

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