In 1924, International Harvester introduced a new row-crop tractor named the "Farmall". Its pioneering tricycle configuration would dominate US farms for the next 30 years. IHC used the Farmall brand for all their tractors with a row-crop front axle until the 1970s. At that point, the name was phased out before finally disappearing completely in 1975. CNH Global has revived the Farmall brand on some of their modern utility tractors.
Case IH - official site
Farmall tractors - information and photos on Farmall tractors.