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24121 Technic Gear Rack 1/4 Circle 11 x 11, 35 Teeth Bricks, Pieces & Parts | eBay
The geometry of the new 11x11 Circle Gear Rack | Brickset
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1x LEGO Technic Toothpicks Curved 11x11x2 Yellow Rack 6151167 24121 | eBay
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LEGO® Element Development: the Friends Hoop – Interview with Poul A Thomsen | New Elementary: LEGO® parts, sets and techniques
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Lego Trophy Uses 24121 Gear Pieces | Using four Lego #24121 … | Flickr
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LEGO Set 42055-1 Bucket Wheel Excavator (2016 Technic) | Rebrickable - Build with LEGO
