Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863493 | High purity acetylene gas | Kengi Yamawaki, Minoru Nishida | 1989-09-05 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863493 | High purity acetylene gas | Kengi Yamawaki, Minoru Nishida | 1989-09-05 |