Packard became one of America's greatest automakers and was remembered worldwide for its luxury cars and its distinctive tombstone-shaped grill trademark. No company sold more luxury cars between 1925 and 1942. Brothers William D. and James W. Packard founded the Packard Motor Car Company in Warren, Ohio, in 1899, then moved it in 1903 to a new factory complex on East Grand Boulevard in Detroit as the city was becoming the Motor City. The company produced fine automobiles there until June 1956, and the Packard Proving Grounds served as its primary testing facility. Packard merged with Studebaker in 1954, and the last Packard automobile was produced in South Bend, Indiana, in 1958.