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K'Nex Intro to Simple Machines: Gears
$59.95
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K'NEX Introduction to Simple Machines: Levers & Pulleys
$49.95
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K'Nex Introduction to Simple Machines: Wheels, Axles & Inclined Planes
$49.95
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K'NEX Levers and Pulleys - 139 PC Building Set
$22.95
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