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Technic, Gearbox 2 x 4 x 3 1/3 : Part 6588 | BrickLink
HELP] Things to make with Gearbox (6588) - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
Technic, Gearbox 2 x 4 x 3 1/3 : Part 6588 | BrickLink
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5 Sets/Lot Technical Parts 2x4x3 1/3 Gearbox 6588 32239 High-Tech Worm Gears 4716 Brick Parts Set fit for EV3 9686 Toys