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NXT® motor internals
Powe Functions LEGO Mindstorms EV3 Medium Servo Motor (45503) Program Robot Part | eBay
EV3 and NXT: Difference and Compatibility – Robotsquare
LEGO MINDSTORMS EV3 Large Servo Motor (45502) | eBay
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Small Boomer - LEGO Mindstorms Car with two-wheel drive | FLLCasts
Amazon.com: LEGO MINDSTORMS EV3 Building Set Includes 3 Interactive Servo Motors, Remote Control, Improved And Redesigned Color Sensor, Redesigned Touch Sensor, Infrared Sensor And 550+ LEGO Technic Elements : Toys & Games