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On August 1, 1921, Hugo Greffenius founded MIAG Mühlenbau und Industrie AG in Frankfurt am Main and acquired the majority of shares in several competing mill construction companies, including AGK and Luther-Werke. These initially still formally independent companies were merged into MIAG in 1925, which moved its headquarters to Braunschweig at the beginning of 1930.

After 1933, the number of employees in Braunschweig grew from around 3,500 employees in 1933 to more than 8,000 in 1936/1937 due to the rapidly increasing armament orders (73 percent of the total order volume in 1938).

The aircraft production of the MIAG - mainly license buildings of the types Messerschmitt Bf 110, Messerschmitt Me 210 and Messerschmitt Me 410 - then took place until the end of the war in the Luther works, which had been spun off again. For this purpose, a production area was acquired at Waggum Airport.