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Coke Blast Furnace

coke_blast_furnacein_game/common/advances/0_age_of_absolutism.txt:159

This is a new type of blast furnace, which uses coke instead of charcoal as its fuel. It is cheaper and allows us to build larger furnaces, although coke has the disadvantage of being less pure than charcoal, which is a problem yet to be addressed.

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