Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5302216 | Method for producing by continuous heat treatments oil-tempered steel wires for springs having high strength and high toughness | Heiji Sugita, Masao Toyama, Hiroharu Sawada | 1994-04-12 |