Assignee
Inventors
- Shigeki Nagai (9 patents)
- Hakobu Sekioka (2 patents)
- Mitsuaki Takenaka (7 patents)
- Masazumi Sakata (1 patents)
- Yosio Kawaguchi (1 patents)
- Seiji Takamura (6 patents)
- Minoru Nishimura (5 patents)
US Patent 4213775 · Granted Jul 22, 1980