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LEGO Technic NEW 12 pcs BLACK WORM AND RACK GEAR SET Screw Track Kit Part Piece Mindstorms NXT robot robotics assortment pack ev3 motor - Walmart.com
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Amazon.com: 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
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Lego Technic Packs - Lego Gear Packs, Lego Pin Packs, Lego Axle Packs, Lego Diff Packs, Lego Connector Packs, Lego Gearbox Packs, Lego Stearing Packs, Lego Suspension Packs
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