STAS SR 11389-1-1995 Studs for drawn arc stud welding Threaded studs and ferrules《拉弧螺柱焊接的螺柱 双头螺栓和金属环》.pdf

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STAS SR 11389-2-1995 Studs for drawn arc stud welding Unthreaded studs and ferrules《拉弧螺柱焊接的螺柱 没有螺纹的螺栓和金属环》.pdf

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