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Herald of Steel - Chapter 300 Blast Furnace
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... product still contained one last impurity.
And to remove this, the cart would be taken to a separate station a bit further from the machine and about fifty workers would scamper into the cart, carrying buckets on their backs, and then start quickly shifting through the crushed ore.
They did this to retrieve the make iron balls that were used to grind the ore and though some balls were inevitably lost, close to 95% retrieval was possible for these expert men.
'Hmmm, I sho ...
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