Jean Bertin was a French engineer and inventor dedicated to aeronautics. In 1944 he entered Snecma and in 1955 he founded his own company "Bertin et Cie" which in 1999 after Jean's death would be renamed "Bertin Technologies", dedicated to R + D (R&D).

"Ludion"

-"Société Bertin et Cie" that worked on behalf of the Ministry of Arms (Air) and "Société d'Etudes et de Realisations d'Engins ballistic" (see SEREB), tested deflection modes for rocket-engine jets, using "aerodynamic". methods.

"Deflected rocket-engine jet"

-A ring was coupled at the end of the nozzle with several holes acting as "deflector" and was fed by ducts coming from controls.

-The response was instantaneous and improved the vehicle's control by the pilot.