Rotary ring holder 动环座

antifriction ring holder screw 减摩环托螺钉

seal ring holder 密封圈座

slip ring holder 推力环架

piston ring holder 活塞环夹持器

seal holder ring 密封座圈

antifriction ring and holder 减摩环及托

electrode-holder ring 电极夹圈

ring binder chart holder 环形装钉活页病史夹