Issued Patents 2017
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9845873 | Combination oil ring | Noriaki Ayuzawa, Atsushi Nakazawa, Masahide Hama | 2017-12-19 |
| 9726286 | Combination oil ring | Noriaki Ayuzawa, Atsushi Nakazawa, Masahide Hama | 2017-08-08 |