Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881137 | Magnetic tape cassette with tape protective closure and lock mechanism | Yoshinori Yamamoto, Masao Ohyama, Kenichi Horikawa, Shigeru Mizusawa, Kenji Kawakami | 1989-11-14 |
| 4843510 | Magnetic tape cassette with tape protective closure and lock mechanism | Yoshinori Yamamoto, Masao Ohyama, Kenichi Horikawa, Shigeru Mizusawa, Kenji Kawakami | 1989-06-27 |