D.S.R. was a French automobile manufacturer that operated briefly between 1908 and 1909. The company, officially known as Sté d'Étude Dannadieu, Saussard et Robert, was based in Paris. The brand specialized in producing light cars, which were notable for their innovative engineering. One of the distinctive features of D.S.R. vehicles was their 4-cylinder valveless air-cooled engine, which set them apart from many contemporaneous designs.…