UNI 6422-1969 Slotted cheese head screws for manufacture of railway and tramway rolling stock ISO metric coarse thread Finish a 《铁路车辆和有轨电车车辆制造用有开槽的圆柱形钉头螺钉 粗距ISO公制螺纹 A级 分类UNI 6107-6.pdf

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