Adler-Werke vorm. Heinrich Kleyer AG
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 people and was making 60 cars a day in addition to commercial vehicles and bicycles. They were Germany's third largest car maker after Opel and BMW. Passenger car production for Adler virtually ended with WWII. A few Adler Trumpf Juniors were made until 1941. During the war, the factory made staff cars and ambulances. When the factory was rebuilt after the war, it was used for the manufacturer of typewriters and motorcycles.