Raab-Katzenstein Flugzeugwerke GmbH formed November 1925 at Kassel by former chief pilot and assistant managing director of Dietrich Flugzeugwerke. First product Schwalbe sport/training biplane, followed by larger RK.2 Pelikan biplane, RK.9 Grasmücke ultralight biplane and RK.25 tandem-seat sporting low-wing monoplane. Sold licence to Pintsch of Austria and reorganized company in Riga, Latvia.