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John William Middendorf IV (November 18, 1959 - June 21, 2024) was an American big wall climber, mountaineering writer and designer of climbing equipment.

In the 1980s, he climbed the hardest walls of Yosemite, including El Capitan and Half Dome, and in 1992 he climbed the largest rock wall in the world, Great Trango Tower. Also in

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