Assignee
Inventors
- Hiroshi Asaumi (6 patents)
- Zenji Shimura (2 patents)
- Takehiro Yoshida (290 patents)
- Kenji Tadakuma (2 patents)
- Shinzaburo Suzuki (3 patents)
- Norio Takada (2 patents)
- Kenichi Nakamura (177 patents)
- Takene Hirai (6 patents)
US Patent 4990544 · Granted Feb 5, 1991