Assignee
Inventors
- Takao Takaya (146 patents)
- Hisashi Takasugi (135 patents)
- Kimio Esumi (3 patents)
- Atsushi Kuno (23 patents)
- Hiroyoshi Sakai (7 patents)
- Kazuhiro Maeda (10 patents)
- Yoshie Sakamoto (2 patents)
US Patent 4990507 · Granted Feb 5, 1991