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hedora
on Sept 20, 2024
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A rigid but foldable indoor airship aerial system ...
I thought you were going to mention concrete canvas, which stiffens into a semipermanent (10 year) structure when wet:
https://www.concretecanvas.com/us/cc-shelters/
Bring your own cave?
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Search:
https://www.concretecanvas.com/us/cc-shelters/
Bring your own cave?