NASA NTRS · 19670000067
Adjustable, self-locking ladder includes optional work platform
Abstract
Height-adjustable ladder with a self-locking platform at its top makes elevated locations more accessible, increases the quantity and size of tools handled there, and decreases the risk of disturbance or damage to components. The retractable platform adapts the ladder to normal use.
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Webster, R. E.. 1967-04-01. Adjustable, self-locking ladder includes optional work platform. https://ntrs.nasa.gov/citations/19670000067
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