Assignee
Inventors
- Sumio Umemura (14 patents)
- Kozo Fujii (23 patents)
- Keigo Nishihira (35 patents)
- Hiroyuki Sawada (5 patents)
- Shuji Tanaka (121 patents)
- Mamoru Nakai (10 patents)
- Hiroshi Yoshida (675 patents)
- Yoshiaki Kuroki (6 patents)
US Patent 4421925 · Granted Dec 20, 1983