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Transformer and Speed Regulator : Set 4548-1 | BrickLink
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7864 Transformer / Speed Controller 12V - Brickipedia, the LEGO Wiki
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GBC Speed Regulation
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Great Ball Pit: Lego 9 Volt Train Speed Regulator 🔌⚡️
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LEGO PART 2868b Hub / Controller, Train Speed Regulator 9V | Rebrickable - Build with LEGO
