Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843766 | Cutting tool having concentrically arranged outside and inside abrasive grain layers and method for production thereof | — | 1989-07-04 |
| 4817341 | Cutting tool having concentrically arranged outside and inside abrasive grain layers and method for production thereof | — | 1989-04-04 |