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Regardless of whether it is an eight feet ladder, a phase ladder or any other general or distinct ladder, it is vital to location it at appropriate angle on ground.
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The identical would be the total situation for a 24 foot ladder. It would have a optimum every on 23 foot and the highest point how the ladder will touch is surely 13 - 17 foot.

2016年7月19日 (火) 14:08時点における版

The identical would be the total situation for a 24 foot ladder. It would have a optimum every on 23 foot and the highest point how the ladder will touch is surely 13 - 17 foot.

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