Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4212471 | Device for cutting a sound groove on a disc recording medium | Tetsuro Izumi | 1980-07-15 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4212471 | Device for cutting a sound groove on a disc recording medium | Tetsuro Izumi | 1980-07-15 |