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LEGO Technic COMPLETE GEARBOX ASSEMBLY 2 x 4 x 3 1/3 Trans-Clear Wormbox gear motor REDUCER block Mindstorms robotics ev3 NXT transparent robot building power functions part 6588 : Amazon.es: Juguetes y juegos
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Lego Parts: Technic, Gear Worm Screw (LBGray) by Parts/Elements - Technic, Gears : Amazon.es: Juguetes y juegos
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