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Question: One of the inspectors in the quality control department has frequently used the Brinell and Rockwell hardness tests, for which equipment is available in the company. He claims that all hardness tests are based on the same principle as the Brinell test, which is that hardness is al-ways measured as the applied load divided by the area of the impressions made by an indentor. (a) Is he cor-rect? (b) If not, what are some of the other principles involved in hardness testing, and what are the associated tests?

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