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, : Mat STEEL <- 2 HRC STEE +90 , 90 .
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5 (Measuring direction) .
6 +90 (Measuring dir +90).
5 (Mat), 6 , (Mat STEEL).
5 (Har), 6 (Har HRC).
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2. 130.
3. .
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5. Amin Amax .
6. σ, ,. XRmax XRmin R.
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6. , XRmax XRmin?