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Pololu - Grant's mini sumo robot: Rattata
Zumo Robot for Arduino [v1.2] : ID 1639 : $109.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Making Perfect Sticky DIY Sumo Robot Tires | MCU on Eclipse
Mini Sumo Robot V2
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Pint-sized Sumo Robot Is Adorable, Accessible And Totally Awesome | Hackaday
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