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Rockwell hardness 30N scale NIST® SRM® 2821, high range (nominal 79 HR30N)

Rockwell hardness 30N scale

Rockwell hardness 30N scale NIST® SRM® 2821, high range (nominal 79 HR30N)

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NIST2819

Rockwell hardness 30N scale,

NIST2820

Rockwell hardness 30N scale,

NIST2821

Rockwell hardness 30N scale, NIST^® SRM^® 2821, high range (nominal 79 HR30N)