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chapter 73 iron and steel iron and steel industry john masaitis iron is most widely found in the crust of the earth in the form of various minerals oxides

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mining as an industry underwent dramatic changes in medieval europe the mining industry in the early middle ages was mainly focused on the extraction of copper and iron

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purification of copper by electrolysis metal extraction

4b purification of copper by electrolysis extraction from ore above the impure copper from a smelter is cast into a block to form the positive anode

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early iron sukashi tsuba - shibuiswords com

fabrication and substance of early iron sukashi tsuba in late muromachi and momoyama periods

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defined metrically such as in 5- 10- or 20-centimeter levels these levels are prescribed when natural layers of stratification are lacking or not easily recognizable

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