Lighter than air : an illustrated history of the airship
1977
270 S.
Buch
Englisch
METHOD AND APPARATUS FOR LIGHTER-THAN-AIR AIRSHIP WITH IMPROVED STRUCTURE AND DELIVERY SYSTEM
Europäisches Patentamt | 2022
|Method and apparatus for lighter-than-air airship with improved structure and delivery system
Europäisches Patentamt | 2021
|