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Why do Power Functions motors need internal gearing - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
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LEGO part 87513c01 - Light Bluish Gray Electric 9V Battery Box Power Functions (Non-Rechargeable) with Dark Bluish Gray Bottom at BrickScout
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Amazon.com: Habow 38Pcs Power-Function Technic-Parts Kit Train-Motor IR Speed Remote Control Battery Box IR Receiver Extension Wire Light Cord Control Switch Compatible with Lego-Motor-Kit. : Toys & Games
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