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