Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7346983 | Method for manufacturing spark plug | Shigeki Tamura | 2008-03-25 |
| 7097525 | Method for manufacturing spark plug using bending process for earth electrode | Shigeki Tamura | 2006-08-29 |