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Designs Enabled by Ball Bearings

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Codex Atlanticus & Da Vinci’s Hoist Machines

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Early Hydroelectricity

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Superconducting Levitation

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Balls, Rollers, and the Need for Cages

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Giotto's Campanile

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The Lowell Textile Mills

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St John’s Baptistry & the Gates of Paradise

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Scuba Gear

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Giant Crossbow

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