In 1912, after visiting some of his wife's Polish relatives and seeing a distinctive set of chevron-toothed wooden gears, he set up a company to manufacture double helical gears and thus was born the double chevron logo.
In 1913, he took over the Mors automobile company and increased output tenfold. With the outbreak of war in 1914, Citroën offered to increase output of munitions shells and the French government gave him the go ahead; his factories produced more than 50 000 shells per day.
In 1919, Citroën started building motor cars at his Javel works. He employed hitherto unknown (in Europe) mass production techniques borrowed from Henry Ford in the USA and within a year was manufacturing 100 cars per day.
In addition to employing mass production, he also supplied cars that were ready to drive from the factory gates, cars that were fitted with bodies (the norm was for the manufacturer to supply a chassis on which a coachbuilder would construct a body built to the client's specification), lights, wheels and tyres. Furthermore, he created a dealer network across France that serviced his vehicles and he provided road signs for the French road network.
He was a paternalistic employer, setting up medical and dental facilities and a gymnasium in his factories and providing a crèche for his workers' children.