Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4939431 | Control system for synchronous rotation of cutter heads, for use in shield machine | Ryuzaburo Otsuka, Takashi Moro, Toshihumi Yuzawa, Seiji Tadano, Kiyoshi Tsuchiya | 1990-07-03 |