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campaign of a blast furnace is the interval from blow-in to blow-in; life of a blast furnace is the interval from blow-in to blow-in; life-cycle of a blast furnace is the interval from blow-in to blow-in; the campaign of a blast furnace is the interval from blow-in to blow-in; the life of a blast furnace is the interval from blow-in to blow-in; the life-cycle of a blast furnace is the interval from blow-in to blow-in |
