HRB اور HB میں فرق کیا ہے؟
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HRB اور HB میں کیا فرق ہے؟
HB، بروک ہارڈنیس کو ظاہر کرتا ہے۔ HRB، بی اسکیل کے مطابق راک ویلڈ ہارڈنیس ہے۔
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