CSN 25 4187-1963 Measuring parts of reference gauges for ring thread NOT GO gauges Cylindrical pipe thread Diameter G 1 8 - G 3 1 2 《非穿过型端螺纹校准量规的测量部件 圆柱型螺纹 G 1 8- - G 3 1 2-直径》.pdf

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