On 21st February 1915, the French Ministry of War, on the recommendation of General Joffre, decided to adopt a steel helmet for the infantry. Less than a month later, the "Dragon's Helmet" design put forward by military artist Georges Scott was chosen, but its overly complex manufacturing method delayed production, to the benefit of Adrian's prototype. Over 7 million were made in the first year alone. The helmet was so successful with the military that western armies ordered it en masse (Italy, Belgium, Serbia, Romania, Holland and Russia).
Adrian helmets were used both in WWI and WWII and as late as 1970 by police forces.
Louis Adrian (1859-1933)