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Kris Folland grows corn, wheat and soybeans and raises cattle on 2,000 acres near Halma in the northwest corner of Minnesota, so his operation is far from small. But when he last bought a new tractor, he opted for an old one - a 1979 John Deere 4440. He retrofitted it with automatic steering guided by satellite, and he and his kids can use the tractor to feed cows, plant fields and run a grain ...