Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887529 | Interchangeable drum unit interchange system | Haruo Ichikawa, Masato Nakatsukasa | 1989-12-19 |
| 4887531 | Interchangeable drum unit type rotary printing machine | Haruo Ichikawa, Masayuki Kiyomiya | 1989-12-19 |