246.3 HBW 10/3000 Brinell block with slightly wider hardness range across the block than usual but fully compliant with ISO 6506
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283 HBW 10/3000 Brinell block dated April 18, corroded underside
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418 HBW 10/3000 Brinell block with slightly wider hardness range across the block than usual but fully compliant with ISO 6506
