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Rock'well num"ber



Metall.
a numerical expression of the hardness of a metal as determined by a test (Rock'well test") made by indenting a test piece with a Brale, or with a steel ball of specific diameter, under two successive loads and measuring the resulting permanent indentation.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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