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Most mishaps involving functioning in height and in ladders can also be avoided as lots of are caused by either improper use or poorly sited ladders that either slide these details or fall.
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Each full calendar yr hundreds are injured and many people today killed by making use of a leaning or extendible ladder.

2016年7月19日 (火) 06:09時点における版

Each full calendar yr hundreds are injured and many people today killed by making use of a leaning or extendible ladder.