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LEGO Set 9719-1 Robotics Invention System, Version 1.0 (1998 Mindstorms > RCX) | Rebrickable - Build with LEGO
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LEGO part 884b - Yellow Mindstorms RCX 1.0 without Power Jack (from Mindstorms 1.5 sets) - Complete Brick at BrickScout
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LEGO Yellow RCX 1.0 Programable Brick with External Power Input (884) | Brick Owl - LEGO Marketplace
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