Joseph Cugnot was a French inventor who was born at Void-Vacon in 1725 and died in Paris in 1804. He is known for having designed and built the first self-propelled, steam-driven vehicle. In 1771, Choiseul financed his building of "Le Fardier", the first steam-driven vehicle, designed to pull pieces of artillery. This model of the oldest self-propelled vehicle has been in the Musée des Arts et Métiers (Museum of Arts and Industry) in Paris since 1801.
Nicolas Lebel was a French soldier who was born in Saint-Mihiel in 1838 and died in 1891 at Vitré. He created the French Army gun that bears his name: the 1886 Lebel. This gun was used by the French Army until 1940.
Pierre Michaux, born at Bar-le-Duc in 1813, was the inventor of the velocipede with pedals in 1861 with his son Ernest, then the motorised velocipede in 1870. There is a monument at Bar-le-Duc that honours the two inventors.