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The Morane-Saulnier M.S.133 was the designation given to four existing parasol wing trainers that were converted to use the 270hp Gnome-Rhone 5Kc radial. Three were produced from M.S.130 swept parasol wing trainers, powered by a 230hp Salmson 9Ab radial engine. The fourth was converted from an M.S.129, originally powered by an180hp Hispano-Suiza engine.