Wall folding fire exit stairs.
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Previously:
https://www.homemadetools.net/forum/...172#post195699
https://www.homemadetools.net/forum/...758#post201962
https://www.homemadetools.net/forum/...464#post162218
https://www.homemadetools.net/forum/...130#post141387
https://www.homemadetools.net/forum/...996#post115136