The ROTO GRIND, designed and patented by Harvey Burrows, is now the top selling Tub Grinder in the World. During the mid 1970's, Harvey designed a grinder capable of grinding all types of forages, grains, and other feeds. This machine controls how fine the grind is without using screens. While designing and fine tuning prototypes, he became satisfied that the new design would eliminate the problems caused by grinding wet materials with screen grinders.