In 1916, while France was bogged down in trench wars, a young engineer named Marcel Bloch was inventing a revolutionary propeller, the Eclair propeller. It would prove very effective in air combat. Today, Dassault Aviation, named after the moniker its founder took on after the war, is among the jewels of the worldwide aeronautics industry. From astonishing growth to unexpected crises, the Dassaul...