An apparatus for evaluating the grade of rice grains includes a grain supply unit, vibrating troughs on which the rice grains run in their longitudinal posture, flow-down troughs having slits each opening to each of the flow-down troughs, a reflected light measuring unit having its light sources and...http://www.google.fr/patents/US5135114?utm_source=gb-gplus-shareBrevet US5135114 - Apparatus for evaluating the grade of rice grains
