NASA NTRS · 19770000121
Mass-balanced portable stairway
Abstract
Multilevel upwardly expandable scaffold accommodates up to four workers. Device consists of base, tower sections, and gangway which are stacked to required height and bolted together for vertical stability. Hollow central rectangular column affords convenient place to store tools and equipment. Maintenance requirements reduced through elimination of hydraulic devices to lift structure.
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Kerley, J. J., Jr.. 1977-06-01. Mass-balanced portable stairway. https://ntrs.nasa.gov/citations/19770000121
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