Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4306837 | Bearingless tail rotor for helicopters | Vas H. Brogdon, Cecil E. Covington | 1981-12-22 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4306837 | Bearingless tail rotor for helicopters | Vas H. Brogdon, Cecil E. Covington | 1981-12-22 |