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The geometry of the new 11x11 Circle Gear Rack | Brickset
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SSHLKBB Technical Parts 4PCS Technical CIRCLE GEAR RACK 11X11 compatible with MOC Building Blocks Lego 24121 for Kids Boys Toy - AliExpress
Slewing bearing with 2 droid wheels and banana gears – Technic Brick Constructions
LEGO® Element Development: the Friends Hoop – Interview with Poul A Thomsen | New Elementary: LEGO® parts, sets and techniques
