The history of the name itself begins with Rapp Motorenwerke, an aircraft engine manufacturer. In April 1917, following the departure of the founder Karl Friedrich Rapp
which led to the company descended from Rapp Motorenwerke being renamed Süddeutsche Bremse AG (known today as Knorr-Bremse). Castiglioni was also an investor in another aircraft company, called "Bayerische Flugzeugwerke
when the company purchased the Automobilwerk Eisenach car company. Automobilwerk Eisenach's current model was the Dixi 3/15, a licensed copy of the Austin 7 which had begun production