https://diedangerdiediekill.blogspot.com/2012/03/hyperboloid-of-engineer-garin-ussr-1965.html?showComment=1332252104446
Die, Danger, Die, Die, Kill!: The Hyperboloid of Engineer Garin (USSR, 1965)
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https://patents.google.com/patent/CN210768912U/en
CN210768912U - Hyperboloid upturning type water-proof gate - Google Patents
A double-curved-surface upturning waterproof gate comprises an upturning gate pivot, a gate frame, an oil cylinder support, an oil cylinder, a gate leaf and a...
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https://www.thehyperboloid.com/
The Hyperboloid
hyperboloid