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Otto Onigkeit (Magdeburg) built before the first world War four monoplanes .

After the War , in 1921-1923 , he built a man-powered plane with crashed at it first taking off in 1923 . Otto Onigkeit was heavily injured .
In 1924 he built a little biplane which he flew until 1935 .
In 1925-1926 he built a monoplane .
At last , in 1938 , he built a new man-powered which flew several times .