N73999 (civil-registered prototype)
E1763718
UNEXPLORED
N73999 is a civil-registered prototype helicopter airframe used in the development and testing of the Bell YOH-4 light observation helicopter.
All labels observed (1)
| Label | Occurrences |
|---|---|
| N73999 (civil-registered prototype) canonical | 1 |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.