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Most incidents involving working at height and in ladders can also be averted as significantly are caused by both improper use or even poorly sited ladders that both slip go!! or fall.
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The a-frame ladder is very useful indeed. Also it is acknowledged as the best variety of ladder. It is often identified as a mini stool or stage ladder since they're extremely light and are only about two feet large.

2016年7月19日 (火) 19:04時点における版

The a-frame ladder is very useful indeed. Also it is acknowledged as the best variety of ladder. It is often identified as a mini stool or stage ladder since they're extremely light and are only about two feet large.

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