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Keep it aloft. Keep it aloft. https://patents.google.com/patent/US9527569B2/en?q=hydrogen&q=blimp&q=reversible&q=battery

High altitude hydrogen generation

Hydrogen0

Keep it aloft. https://patents.google.com/patent/US9527569B2/en?q=hydrogen&q=blimp&q=reversible&q=battery

None: High altitude hydrogen generation (last edited 2017-10-28 14:00:00 by DuncanCarlsmith)