Deidt
Deidt was a racing car constructor, founded by Emil Deidt. Deidt chassis won the Indianapolis 500 in 1947 (Mauri Rose), 1948 (Mauri Rose) and 1949 (Bill Holland), with Offenhauser engines. Those 3 victories were the only major American open-wheel racing (AAA) wins for the manufacturer. The 1947 and 1948 winning car, called "Blue Crown Special", had the particularity of being front-wheel driven. Deidt cars competed in the FIA World Championship from 1950 to 1952, as the Indianapolis 500 was part of the championship during those years. The last participation in the Indy 500 for a Deidt chassis was in 1952, and the last qualifying attempt was in 1953. World Championship (Indy 500) results

References 

Formula One constructors (Indianapolis only)
American racecar constructors