Mechanical Advantage: Tools for the Wild Vertical | John Middendorf | Substack

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Mechanical Advantage: Tools for the Wild Vertical

The history of engineered tools for climbing and alpinism. (Looking for D4 portaledges? See bigwalls.net)

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BigWalls main page

Original Mechanical Advantage posted on bigwalls.net

Mechanical Advantage published in Ascent

Mechanical Advantage: Tools for the Wild Vertical

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