| Hokkaido Sales Office |
| 1007-47 Izumisawa, Chitose-city, Hokkaido, 066-0051, Japan TEL.+81-123-28-3282 FAX.+81-123-28-3283 |
| MARUWA QUARTZ Chitose Plant |
| 1007-47 Izumisawa, Chitose-city, Hokkaido, 066-0051, Japan TEL.+81-123-28-3166 FAX.+81-123-28-3101 |