Archaeologists have discovered a decarburization kiln dating back to the Warring States Period (475 B.C.-221 B.C.) in the Houduanwan cast-iron relics site in Henan Province, according to The Xinhua ...
Undated photo provided by Henan Provincial Institute of Cultural Heritage and Archaeology shows a view of the Houduanwan cast-iron relics site in Xinzheng, Central China's Henan province. [Photo/Henan ...
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