Exhibited a folding-wing roadable biplane at the 1921 Paris Salon. This had an auxiliary engine to drive the landing wheels, which could be used also as a self-starter for the main engine. When driven on the road it travelled tail first. He developed also for the French Army a two-seat reconnaissance aircraft designated T.4, which also featured a two-cylinder auxiliary engine. This was not only intended for main engine starting, but was also used to power a generator in flight to provide essential electrical services, and in particular to make possible the use of early air-to-ground communication equipment.