Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887511 | Hydraulic control valve apparatus | Tsutomu Sugiyama | 1989-12-19 |
| 4816983 | Enclosed D.C. converting station | Isao Nishio | 1989-03-28 |
TY
Toshiaki Yoshizumi
Overall (1989): #13,828 of 140,708Top 10%
2
Patents 1989