Earthquake safety helmet chair.
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Previously:
https://www.homemadetools.net/forum/...801#post194200
https://www.homemadetools.net/forum/...779#post202018
https://www.homemadetools.net/forum/...720#post163352
https://www.homemadetools.net/forum/...722#post216491
https://www.homemadetools.net/forum/...601#post201352
