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Lego Mindstorms Old Light Gray Electric 9V Mini-Motor 71427 Technic - Tested | eBay
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LEGO Technic Electric Motor Alto Light Grey 1 x 9 V Mini Motor Electric tested for Set KB565 8479 9747 3804 9794 9735 71427 °C01 : Amazon.de: Business, Industry & Science
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LEGO Motor Speed Meter by NXT and RCX Rotation Sensor - YouTube
Lego Technic Motor 43362 internals
LEGO PART 71427c01 Motor, 9V Mini [Old Style] | Rebrickable - Build with LEGO
Lego Technic - Testing 43362 Vintage RCX Motor - YouTube