sentences:  During the 1960s the DCOF-405 or "Emeryville" was the top seller among American trucks for four years.In 1965, International Harvester introduced the CO-4000, replacing the DCO-400.Featuring a larger and wider cab, the CO-4000 was distinguished by a large trapezoidal grille, a design feature that would be used on International cabovers into the late 1990s.