最終更新日:2022/12/24
Output at the Pen-ch'i mine, which produced somewhat under 1 million tons annually during 1942-1944, was around 500,000 tons in 1949.
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Output at the Pen-ch'i mine, which produced somewhat under 1 million tons annually during 1942-1944, was around 500,000 tons in 1949.