back draft change gear后牵伸变换齿轮
draft change gear牵伸变换齿轮
draft gear recoil缓冲器反弹
spring friction draft gear弹簧摩擦式缓冲器
draft gear follower缓冲器从板
Draft gear assembly发明名称
elastomer draft gear弹性胶泥缓冲器
rubber friction draft gear橡胶摩擦式缓冲器;橡胶冲突式缓冲器
hydropneumatic draft gear液力气动式缓冲器