Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4840296 | Clamping and fixing apparatus for a refractory-made plate for a slide gate valve for controlling a molten steel flow | Takashi Otsuka, Kenji Yamamoto, Tadao Taniguchi, Yoshifumi Shigeta, Mototsugu Osada | 1989-06-20 |