Previously, evacuees who evacuate to a rooftop instead of evacuating to the ground through downstairs are saved by a helicopter in case of a fire of a sky scraper. However, access of the helicopter is hard to perform saving in case of a turbulence caused by the fire. The present invention is a foldable ladder allowing the evacuee to safely evacuate to a next building in a situation as described above.;COPYRIGHT KIPO 2018
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