by Bethenod include: Joseph Béthenod (1908), "Sur le transformateur à résonance", Eclairage électrique, Chartres: impr. de Durand Joseph Béthenod (1923)
first radiotelegraphic radio connection in tropical countries with Joseph Béthenod. The radio connection systems were designed for the Radioelectric French
Tower. In 1908 the young polytechnic Émile Girardeau joined Ferrié's team. Girardeau and the scientist Joseph Bethenod decided to found a French company