Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887950 | Waterproof nut | Kiyoshi Sakayori, Shinichi Iwasaki, Yozo Ishida, Toshikazu Shinogaya | 1989-12-19 |
YI
Yuzo Ishizuka
Overall (1989): #39,719 of 140,708Top 30%
1
Patents 1989