NASA NTRS · 19690000180
Space-saving hoist for tank manholes
Abstract
Working platform and collapsible basket facilitate entry of men with equipment into the overhead manhole of a deep tank. A winch and pulley rigging hold the basket which is suspended in the manhole. The basket is suspended at three points without the rig impinging on the area of the manhole.
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Ehrhardt, W. R., Jr.. 1969-07-01. Space-saving hoist for tank manholes. https://ntrs.nasa.gov/citations/19690000180
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