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GBT 230.1-2018 Metallic Materials — Rockwell Hardness Test — Part 1: Test Method

GBT 230.1-2018 Metallic Materials — Rockwell Hardness Test — Part 1: Test Method

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GBT 230.2-2012 Metallic Materials — Rockwell Hardness Test — Part 2: Verification and Calibration of Hardness Testers

GBT 230.2-2012 Metallic Materials — Rockwell Hardness Test — Part 2: Verification and Calibration of Hardness Testers

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GBT 230.3-2012 Metallic Materials — Rockwell Hardness Test — Part 3: Calibration of Standard Hardness Blocks

GBT 230.3-2012 Metallic Materials — Rockwell Hardness Test — Part 3: Calibration of Standard Hardness Blocks

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GBT 231.1-2018 Metallic Materials — Brinell Hardness Test — Part 1: Test Method

GBT 231.1-2018 Metallic Materials — Brinell Hardness Test — Part 1: Test Method

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GBT 231.2-2012 Metallic Materials — Brinell Hardness Test — Part 2: Verification and Calibration of Hardness Testers

GBT 231.2-2012 Metallic Materials — Brinell Hardness Test — Part 2: Verification and Calibration of Hardness Testers

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GBT 231.3-2012 Metallic Materials — Brinell Hardness Test — Part 3: Calibration of Standard Hardness Blocks

GBT 231.3-2012 Metallic Materials — Brinell Hardness Test — Part 3: Calibration of Standard Hardness Blocks

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