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Extension ladders are separated into two or three pieces, you could pull-up and slide for straightforward storage jointly. It could be only expanded to its optimum length by sliding the pieces apart either manually or using a pulley procedure.
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The walking ladder can be an additional broad ladder which you are ready to balance on, and then figure out how to walk along the ground moving the feet of the ladder (1 phase at a time)!

2016年7月24日 (日) 21:27時点における版

The walking ladder can be an additional broad ladder which you are ready to balance on, and then figure out how to walk along the ground moving the feet of the ladder (1 phase at a time)!

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