Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5316090 | Attitude control device and drilling-direction control device | Yoshihide Kiyosawa, Akio Ikeda | 1994-05-31 |
| 5307885 | Attitude and drilling-direction control device | Yoshihide Kiyosawa, Akio Ikeda | 1994-05-03 |