SEI Optifrontier Co., Ltd．
| COUNTRY | Japan |
|---|---|
| ADDRESS | 1 Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa 244-8589 Japan |
| TEL | +(81)-45-853-7100 |
| FAX | +(81)-45-852-7922 |
| BUSINESS | Manufacture and sales of optical network devices and components, optical fiber cables, machinery and appliances for communication |