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BrickLink - Part x186 : LEGO Technic, Gear Reduction Block 20x, 3 x 4 x 2 1/3 [Technic, Gear] - BrickLink Reference Catalog
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Amazon.com: PHYNEDI High Reduction Modern-Style Church Bricks Model Compatible Lego, MOC DIY Small Particle Construction Building Toy Adult, MOC-34956 (7,517+pcs), 28.6 x 53.8 x 57.5cm (571637155L5OIRD) : Toys & Games
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BrickLink - Set 872-1 : LEGO Two Gear Blocks (Gear Reduction Kit) [Technic:Expert Builder] - BrickLink Reference Catalog
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