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Technic, Gear 16 Tooth (New Style Reinforced)
Technic, Gear 40 Tooth : Part 3649 | BrickLink
116PCS Gear and Axle Set for Technic Parts Compatible with with Major Brand Technic Parts, DIY Gears Assortment Pack(Gears Pins Axles Differential ...
LEGO Technic Gears Plus Accessory Pack
How to mesh any two Lego gears on a regular grid!
Lego Technic Gears Pack and Special Parts – Green Gecko Workshop
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Lego Technic Gears with Tooth for gearbox or other mechanisms - new parts