The Morane-Saulnier M.S.137 was a version of the parasol wing M.S.138 trainer that was powered by a 120hp Salmson 9Ac radial engine in place of the 80hp Rhône 9C used on the M.S.138.
How to cite this article:
Rickard, J (15 February 2012), Morane-Saulnier M.S.137 , http://www.historyofwar.org/articles/weapons_morane_saulnier_MS137.html