Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4811627 | Main transmission gearbox for a twin-engined helicopter | — | 1989-03-14 |
| 4809931 | "Directional and stabilizing device having a faired and slanted antitorque rotor and a disymmetric ""V"" empennage, and a helicopter equipped with such a device" | Philippe Alain Jean Rollet | 1989-03-07 |