What is the 4 to 1 Rule When Using a Ladder? - Why you Should Use it!
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Extension ladders
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Factors Affecting Extension Ladder Angular Positioning - Peter Simeonov, Hongwei Hsiao, In-Ju Kim, John R. Powers, Tsui-Ying Kau, 2012
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Ladder Safety Tips: Single and Extension Ladders - ANSI Blog
Ladder Safety -
Tips and Techniques for Safe Extension Ladder Setup and Use (DIY)
