Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868962 | Method of fabricating a helicopter rotor system | Francis H. McArdle | 1989-09-26 |
| 4795310 | Helicopter rotor system and method | Francis H. McArdle, Richard T. DeRosa | 1989-01-03 |