The Dufaux 4 was an experimental aircraft built in Switzerland in 1909 and which was originally constructed as an un-named biplane the third aircraft constructed by the brothers Armand and Henri Dufaux. The aircraft was entirely conventional for the era - a two-bay biplane with unstaggered wings of equal span and a triangular-section fuselage.
Made by Armand DufauxHenri DufauxArmand and Henri Dufaux.