PrEN ISO 16859-1 "Metallic materials - Leeb hardness test - Part 1: Test method"
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PrEN ISO 16859-3 "Metallic materials - Leeb hardness test - Part 3: Calibration of reference test blocks"
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PrEN ISO 16859-2 "Metallic materials - Leeb hardness test - Part 2: Verification and calibration of the testing devices"
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