Assignee
- Nippon Telegraph And Telephone Public
- Oki Electric Industry Co.
- Nippon Electric Co.
- Fujitsu Limited
- Hitachi
Inventors
- Michio Tokunaga (4 patents)
- Ryoichi Okada (3 patents)
- Hideo Mizutani (65 patents)
- Koichi Hasegawa (105 patents)
- Takaaki Osaki (4 patents)