Assignee
Inventors
- Takao Sugino (2 patents)
- Toshio Kawamura (30 patents)
- Masamichi Asai (5 patents)
- Hiroshi Yamada (563 patents)
- Kenichi Mukoyama (3 patents)
- Akira Takahashi (5 patents)
- Hiroshi Hikima (10 patents)
US Patent 4970180 · Granted Nov 13, 1990