 The company gradually acquired all the land that constituted the embryo of what is now the Gosselies aerodrome.In the 1920s, SEGA carried out repairs, produced under license 5 AVIA BH-21, and even prototypes of the HB-1 based on plans by Henri Bulté.In 1931, when Belgium bought 43 Fairey Firefly IIM, the contract stipulated that part of the equipment (33) had to be manufactured in Belgium.