The Asaseishi Rice Production Group of Aomori Prefecture purchased eight Ford 4000 units in 1974. This year, 31 years later, they replaced the Ford 4000 tractors with six TN75SA units. Thirty of the group’s operators were the driving force behind the replacement decision. Mr. Goto, the leader of the group, said that the investment in the TN75SA units enhanced the efficiency of spring operations by 25%, and reduced the spring operations period by 4 days.