Assignee
Inventors
- Sumio Umemura (14 patents)
- Kanenobu Matsui (8 patents)
- Yoshinari Ikeda (2 patents)
- Katsuro Masunaga (6 patents)
- Takumi Kadota (6 patents)
- Kozo Fujii (23 patents)
- Keigo Nishihira (35 patents)
- Masaoki Matsuda (10 patents)
US Patent 4260810 · Granted Apr 7, 1981