Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875519 | Method of manufacturing hollow billet and apparatus therefor | Yoh Ishii, Masami Abe, Yuhzoh Harada, Atsumi Takasugi | 1989-10-24 |
| 4860568 | Tubular material drawing apparatus for manufacturing precision tube | Yukio Yamanoi, Mitsuo Kandachi, Masahiro Iwata | 1989-08-29 |