Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6644094 | Traction coefficient measurement device | Hiroya Achiha, Shinichi Natsumeda | 2003-11-11 |
| 6554730 | Auxiliary device for bicycle with traction roller type gear | Koichi Sakai, Hisashi Machida, Atsushi Ozawa | 2003-04-29 |