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TechnicBRICKs: TBs TechTips 004 - Automatic gearboxes | Lego custom minifigures, Lego mechanics, Lego machines
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LEGO Automatic Gearbox with Speed Locking + INSTRUCTIONS - YouTube | Lego, Lego technic sets, Lego design
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Simplest automatic LEGO transmission in the world? Really functional. Principle explained. - YouTube
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Sliding worm 3-speed automatic gearbox - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
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