Doble was one of the most advanced and iconic brands in the history of steam-powered automobiles, founded by the Abner brothers in the United States at the beginning of the 20th century. Their vision was to combine the power and smoothness of steam with the comfort and elegance of luxury cars. The Series E (1922–1925) was their most successful and iconic model. Later, the Series F (1930-1931) sought to perfect the concept with technical improvements to the boiler and auxiliary systems, although its production was very limited. Both models reflect the brand's philosophy: radical innovation, artisanal luxury, and a determined commitment to demonstrating that steam could compete with internal combustion, leaving a legacy that is still studied today as a benchmark in automotive engineering.