The Farmall was the first general purpose tractor with narrowly spaced front wheels. It was introduced as a new model in the McCormick-Deering line of tractors from International Harvester (IH) in 1924. The narrow front combined with good ground clearance allowed for more nimble and accurate field cultivation, yet the Farmall could perform all the other duties a farmer would have previously achieved using a team of horses. The Farmall H, produced from 1939 to 1952, became the top selling individual tractor model of all time in North America with over 390,000 sold.
In time, other tractor manufacturers introduced models with a similar form factor as the Farmall. As a class, these are generally referred to as row crop tractors.