Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5341606 | Device for cutting and grinding a doughnut shaped substrate and a method therefor | — | 1994-08-30 |
| 5285598 | Method for drilling a processed hole to a hard but brittle material and a device therefor | Tomoo Arita | 1994-02-15 |