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LEGO® Part 30104 Chain 21 Links (16-17L) - Connect and Customize with this Versatile LEGO Chain!
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Amazon.com: LEGO Chain Reactions (Klutz Science/STEM Activity Kit), 9" Length x 1.06" Width x 10" Height : Pat Murphy and the Scientists of Klutz Labs: Toys & Games
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Lego 5 New Black Technic Link Chain Pieces | eBay
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Chain 21 Links (16-17L) : Part 30104 | BrickLink
Lego Chain Update | 3D CAD Model Library | GrabCAD