Assignee
Inventors
- Erwin Marti (10 patents)
- Oskar Heiber (1 patents)
- Alexandre Gumma (1 patents)
- Gustave Huber (5 patents)
- Isamu Utsumi (5 patents)
- Hiroshi Nakagawa (9 patents)
- Tatsuhiko Miyata (1 patents)
- Koichi Akimoto (1 patents)
US Patent 4515804 · Granted May 7, 1985