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Amazon.com: PHYNEDI Manual 8 Speed Gearbox Transmission Bricks Model Compatible 25.8 x 13.6 x 12.1cm I1444NB43POA 0 : Toys & Games
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Super Easy Building Instructions - 4 Speed Gearbox - Lego Technic Mastery | Lego mindstorms, Lego gears, Lego technic
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Super Easy Building Instructions - 3 Speed Gearbox - 7 studs - Lego Technic | Lego gears, Lego, Lego technic
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LEGO MOC 3-speed gearbox with comfortable manual step switch by Don_Santos | Rebrickable - Build with LEGO
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