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WHY EXTREME ENGINEERING’S AUTO-BELAY SYSTEM? The President of Extreme Engineering, Jeff Wilson, holds the US Patent for the first automatic belay system and is a chairman on the ASTM (American Society of Testing Materi
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Document Date: 2015-09-01 21:55:59
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File Size: 1,90 MB
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WHY EXTREME ENGINEERING’S AUTO-BELAY SYSTEM? The President of Extreme Engineering, Jeff Wilson, holds the US Patent for the first automatic belay system and is a chairman on the ASTM (American Society of Testing Materi