USPC 244/30
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Airships:
This subclass is indented under subclass 24. Propelled aeronautical machines sustained by their buoyancy relative to the air.
| Enclosing categories | USPC 244/24 |
|---|---|
| Subcategories | |
| Keywords | LTA, Propulsion, USPC 244/61, USPC 244/94, USPC 244/95, USPC 244/96, USPC 244/125, USPC 244/126, USPC 244/127, USPC 244/128 |
| Start year | |
| End year |
