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hoist
where I work our over head trolleys have a cable about 1-2 feet above I beam with little rollers on it from the rollers they hang the power cable and it goes back and forth with the hoist unit and just kinda folds up and unfolds as it moves real slick and easy to do I wolud get you a pictiure but no cameras allowed in there !!!! a truck driver to a picture of his truck in the plant one day they banned him from enteringthe site again and fined his company and confiscated his camera !!! we can't have cell phones becauase of cameras in them LOL hope this helps
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