Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4711501 | Rock crushing device | Akiya Maeda, Mituya Sakai, Yukinobu Masaka, Masahiro Nomura, Yasuo Yamada | 1987-12-08 |
| 4392744 | Method of and apparatus for determining angular and transversal displacements of shield machine and succeeding pipe | Masao Okabe | 1983-07-12 |