[eng] Abstract : This short conclusive paper sums up - among a rich collection - some of the topics ponited out by the authors, and presents a personal analysis of the relations between industrial activity - as a sui generis mean for create or support economic welfare in any kind of society -...

[eng] Abstract From 1918 to 1940, french aircraft engines makers did loose their former world leadership, as well as designers as manufacturers. American, British and German reliability and achievement were higher. French motorists neglected fuel injection and, until the late twenties, payed...