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Amazon.com : GM CLIMBING Hardware Kit for 5:1 Mechanical Advantage Pulley Hauling Dragging System Block and Tackle (Orange Sling) : Sports & Outdoors
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PMI Rope | HARKEN Wingman for rescuers and climbers - buy online - PMI Rope
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Rock Climbing Tree Arborist Mechanical Prusik Pulley Pulling Device Equipment - Black - Walmart.com
Using A Mechanical Ascender To Climb A Rope | Climbing Daily Ep.1554 - YouTube
American Alpine Institute - Climbing Blog: Ascending Systems
