The combine harvester, or simply combine, is a machine that combines the tasks of harvesting, threshing, and cleaning grain crops. The objective is the harvest of the crop, such as corn or wheat. The combine was patented in 1834, by Hiram Moore, the same year as Cyrus McCormick was granted a patent on the mechanical reaper. Early combines were drawn by horse or mule teams and used a large wheel to provide power. Tractor-drawn, PTO-powered combines were used for awhile, and then tractor drawn combines evolved to have separate gas or diesel engines to power the grain separation. Today's combines are self-propelled and use diesel engines, with on-board electronics and instrumentations allowing operators to get better grain yields by optimizing ground speed and other operating parameters. Popular models include: John Deere S680; John Deere S670; Case IH 2388; Case IH 8230; New Holland CX8080; and John Deere 9870 STS. IronSearch is your source for new and used Combines, including John Deere, Case IH, New Holland, and Massey Ferguson. IronSearch features new and used combines from ag equipment dealers and farmers in thousands of farm classifieds listings of ag equipment for sale.