In the 1950s, there was the BMW Isetta, the Iso Isetta and the Heinkel Kabine. They all had front-opening doors and coexisted on the market. Only the Hoffmann car cabin, whose doors opened to the side, was banned and drove an up-and-coming industrial group into bankruptcy. This article looks back at an interesting piece of industrial history, analyzes the technology of the Hoffmann Auto-Kabine and looks at historical pictures and the sales brochure of the time.