Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4230423 | Ice-breaking apparatus for structure for use in icy waters | Masanao Oshima, Mikihisa Komoto, Tsuneo Inokawa | 1980-10-28 |
| 4198917 | Ice-breaking means for ships | Masanao Oshima, Mikihisa Komoto, Tsuneo Inokawa | 1980-04-22 |