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| − | + | A lot of accidents take place by way of incorrect utilization of a ladders, or people wanting to use a chair, stool or several other object to function at height. | |
2016年7月19日 (火) 08:24時点における版
A lot of accidents take place by way of incorrect utilization of a ladders, or people wanting to use a chair, stool or several other object to function at height.