Four Wheeled Cart Mount for Ariel Ladder
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For safety, a rigid ladder should be leaned at an angle of about fifteen degrees to the vertical. In other words, the distance from the foot of the ladder to the wall should be about one quarter of the height of the top of the ladder. At steeper angles, the ladder is at risk of toppling backwards when the climber leans away from it
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Government Printing Office The Official Gazette of the United States Patent Office (Washington, DC: Government Printing Office, 1895)
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