A.B.C. began producing motorboat and airplane engines prior to World War I, and by the early 1910s, they began producing engines for motorcycles and cyclecars.  By 1920, they formed a new company called A.B.C. motors to make airplane engines, motorcycles, and a new light car.  

The “L-Category” is a class of cars and mopeds in France that can be driven without a driver’s license. This new category called sans permis (without license), began in the mid 1970s, and ACOMA became a large manufacturer of these modern microcars, taking 30% of the market.

In 1880, Heinrich Kleyer founded a bicycle business and by 1900 he moved to automobiles. During World War I, Adler built trucks, transmissions for tanks, and airplane engines. By 1928 Adler, employed 6,000 and was making 60 cars a day in addition to commercial vehicles and bicycles. 

After three years of production of the Aero 10, Aero introduced an updated version of this car in 1931.  The new car was called Aero 18.

With the introduction of the Aero 30 in 1934 Aero took a giant step forward in its car business.

Introduced in 1914, the Aero-Sled Company of Chicago, Illinois, marketed their propeller-powered vehicle as both a practical means of winter transportation and for the new winter sport, motorized ice-sledding!