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PURPOSE : A grain grinder is provided to grind grains successively by modulating the size of perforation hole.CONSTITUTION : A grinder comprises : an inlet in the upper part; a discharging hole ejecting pulverized material in the lower part; and a rotary shaft attached with multiple cutters. More than two partition rooms are formed along a vertical shaft by more than a porous partition inside of the grinder. The pulverized material crushed in the partition room is transferred to a lower part partition room through the porous partition then ejected after a re-pulverization.COPYRIGHT KIPO 2013