TWIN RELEASE KIT - Petzl's 4:1 Hauling & Lowering System
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Como funciona el sistema de poleas con cuerdas
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How To Use the TWIN RELEASE in a confined space rescue
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Ultra Minimalist Rope Rescue Rigging: Using Only Prusiks & Carabiners
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Petzl RAD LINE Masterclass Ep1 // Dave Searle
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MID-TRANSFER RESCUE
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This is how simple pulley systems work - Rope Access Rigging
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Kit de Rescate Marc 4
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