Collapsible emergency exit staircase.
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Previously:
https://www.homemadetools.net/forum/...597#post209285
https://www.homemadetools.net/forum/...052#post210738
https://www.homemadetools.net/forum/...508#post185655
https://www.homemadetools.net/forum/...356#post104050
https://www.homemadetools.net/forum/...133#post191631