| TSE | (312) 417 8330 |
| LRQO | (216) 492 2183 |
| Meyer | (216) 365 0503 |
| RINA | (216) 416 6393 |
| ABS | (212) 292 4114 |
| Bureau Veritas | (212) 275 5161 |
| DNV | (212) 258 2484 |
| ISAC | (212) 213 3145 |
| RWTÜV Türkiye | (212) 245 3106 |
| SGS | (212) 296 8650 |
| Moddy Int. Kalite Servisleri Ltd. | (216) 478 3136 |
| National Quality Assurance | (216) 361 2485 |
