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Electric, Train Speed Regulator 9V Power Adapter 230V 50Hz (Continental European) : Part 70928 | BrickLink
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Power Functions ADAPTER for 9V Battery Use - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
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LEGO PART 70928 Electric Adapter / Transformer, 230V, Train Speed Regulator 9V (Continental European Type) | Rebrickable - Build with LEGO
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LEGO PART 70931 Electric Adapter / Transformer, 120V 60Hz, Train Speed Regulator 9V | Rebrickable - Build with LEGO
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