Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854787 | Boring device | Yasumasa Ooki, Toshio Mikiya | 1989-08-08 |
| 4824299 | Chip breaking device for annular cutters | Michihiro Shoji | 1989-04-25 |
| 4820088 | Boring device | Yasumasa Ooki, Toshio Mikiya | 1989-04-11 |