Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4643304 | Tape cartridge with extending reference surfaces | Takashi Sumida, Takao Ketori | 1987-02-17 |
| 4340426 | Additives for continuous casting of steel | Seikichi Tabei | 1982-07-20 |
| 4290562 | Hub for use in a magnetic recording tape cassette | Osamu Yamamoto | 1981-09-22 |