and variety of "etceterinis" is amazing. There were any number of makers that built one off engines totally from scratch, plus many cars that were continiosly modified and virually became another car. There were also more companies making "spped equipment" (intakes, cams, cylinder heads, etc) than ever existed in the American hot rod industry. Some companies were full fledged car makers, others modifiers, and some tuners. There is a lot of interconnection between companies too. Roselli, who was origanally an Alfa aircraft engineer and was the main person responsible for the design of the pre-war Bimotore grand prix car also was involved in the construction of the Auto-Avio 815 (esentually, the 1st Ferrari), and in the design and construction of various other cars.