Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883557 | Method for lining pipe lines with a pressurized gas | Akio Morinaga, Hideo Maruyama, Akifumi Yamamoto | 1989-11-28 |
| 4871413 | Apparatus for manufacturing tubular lining material | Masakatsu Hyodo, Koji Kusumoto | 1989-10-03 |