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Many accidents arise via improper usage of a ladders, or folks attempting to use a chair, stool or other object to just operate at height.
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Various styles of roof ladders<br><br>Roof ladders can be identified in a variety of styles with few variations in their characteristics for different utilities.

2016年7月17日 (日) 05:24時点における版

Various styles of roof ladders

Roof ladders can be identified in a variety of styles with few variations in their characteristics for different utilities.

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