Michel BOREL, Retired since 2010, mechanics lecturer at CNAM Center in Versailles (1971-1999); associated professor at Petroleum and Motors National high School - ENSPM (1978-2008); engineer at Bertin Society (1970-1980); engineer at General Armement Direction - DGA (1980-2009). Georges VÉNIZÉLOS, Professor, Chair of Mechanical Systems Designing, Conservatoire National des Arts et Métiers (CNAM).