Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5655878 | Higher harmonic control apparatus for a helicopter rotor | Eiichi Yamakawa, Atsushi Murashige | 1997-08-12 |
| 5639215 | Helicopter rotor equipped with flaps | Eiichi Yamakawa, Eiji Shima | 1997-06-17 |