04:33 Arm lifter (prototype) The arm stops temporarily by the weight transfer of the elongate hole and the weight. 0
04:33 Arm lifter (prototype #2) Center of gravity moves easily so that the ball may be made a weight, and it may roll. Therefore, the weight can be small. 0
04:33 Triple arms lifter When two balls entered the first arm, the device returned based on the one ball was done. 0