NBN A 11-403-1982 3125 《冶金产品 用于洛氏硬度试验机的参考块的校正（等级B，C，N 和 T）》.pdf

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ASTM E18-2011 5694 Standard Test Methods for Rockwell Hardness of Metallic Materials《金属材料洛氏硬度的标准试验方法》.pdf

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ASTM E18-2008b 402 Standard Test Methods for Rockwell Hardness of Metallic Materials 《金属材料洛氏硬度的标准试验方法》.pdf

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ASTM E18-2014 9442 Standard Test Methods for Rockwell Hardness of Metallic Materials《金属材料洛氏硬度的标准试验方法》.pdf

ANSI ASTM E18-2017 Standard Test Methods for Rockwell Hardness of Metallic Materials《金属材料洛氏硬度的标准试验方法》.pdf

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