Assignee
Inventors
- Hiroyuki Umemura (14 patents)
- Kenji Togashi (6 patents)
- Kenji Matsuda (116 patents)
- Tetsuji Okada (16 patents)
- Hidenori Ishioka (20 patents)
- Katsuyuki Aoki (41 patents)
- Sakuo Sugawara (13 patents)
- Masanori Hara (75 patents)
US Patent 4909310 · Granted Mar 20, 1990