Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880474 | Method and apparatus for operating vacuum cleaner | Haruo Koharagi, Kazuo Tahara, Tsunehiro Endo, Kunio Miyashita, Yoshitaro Ishii +5 more | 1989-11-14 |
| 4846768 | Variable-speed driving device | Yasuo Kitami, Hidenori Tezuka | 1989-07-11 |