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Ladder safety is 1 of the most important elements you can have in your head when twenty feet up thoroughly that and possibly not dropping.
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Even a Stage Ladder could be harmful if good sense is not utilized. There are 160,000 documented injuries every 12 months from ladders, many would be because of lack of safety and precautions.

2016年7月18日 (月) 20:18時点における版

Even a Stage Ladder could be harmful if good sense is not utilized. There are 160,000 documented injuries every 12 months from ladders, many would be because of lack of safety and precautions.