BERLIN

Berlin Technische Hochschule had Flugtechnische Fachgruppe 1931-45 which produced research and experimental aircraft, notably AB.4 (Akaflieg Berlin No. 4) trim parasol single-seater 1931 and B 9 (built in partnership with DVL research organization) for prone-pilot research, 2 x 105-hp Hirth (1937).

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