Assignee
Inventors
- Masashi Usuda (4 patents)
- Kiyoshi Shimizu (1 patents)
- Eiji Iwata (1 patents)
- Hideo Yamada (3 patents)
- Kazutaka Onozuka (1 patents)
- Toshio Kuno (4 patents)
- Hideo Kuno (1 patents)
- Yukio Kuno (5 patents)
US Patent 4790237 · Granted Dec 13, 1988