Kellner-Béchereau EC.4
 The Kellner-Béchereau EC.4 and Kellner-Béchereau ED.5 were a pair of French training aircraft with side-by-side seating and a novel double wing patented by their designer Louis Béchereau. The principal difference was that the EC.4 had an all-wood structure whereas the ED.5 was all-metal. Both were single-engine mid-wing cantilever monoplanes.