| 1. | Machine tools ; multi - spindle heads ; protection rings type a 机床.多轴头. a型保护环 |
| 2. | Two - fiber bi - directional path protection ring 二纤双向通道保护环 |
| 3. | Two - fiber unidirectional path protection ring 二纤单向通道保护环 |
| 4. | Four - fiber ms shared protection ring 四纤双向复用段共享保护环 |
| 5. | Two - fiber ms shared protection ring 二纤双向复用段共享保护环 |
| 6. | Shared protection ring 共用保护环 |
| 7. | Hinged covers ; circular shape with protection ring and surface coated ; dn 500 and dn 600 具有保护环和表面涂层的圆形绞链式闸板.第3部分:额定 |