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MTL - Three Kingdoms - Chapter 2200 food
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... have been before the Spring and Autumn and Warring States Periods, or even earlier, but the use of coal for metallurgy began in the Han Dynasty.
The mining of ore, including the production technology of black minerals such as coal, was relatively mature in the early Han Dynasty. Large-scale mines and mines, as well as the use of mines, are already considered to be at the top level in the world, but because of the gentry’s demand for charcoal It is relatively large and looks down on coal, ...
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