Each has a hydrostatic transmission and a ... is far smaller than any other tractor tested. Like the Ariens, the Simplicity cuts in reverse with a simple move of the shift lever.

By the mid-1960s, many tractors provided 12 forward speeds and some as many as 16 or 18. Then in the summer of 1967, International Harvester introduced a hydrostatic drive for its 656 tractor ...