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以匹兹堡和密执安为基地的球团技术公司(PTC)宣称,它将于1986年7月在密执安州马凯特矿区拥有一座年产量为8万吨装备
The Pittsburgh and Michigan-based pelletizing technology company (PTC) announces that it will have a production capacity of 80,000 tonnes per annum in July 1986 in the Marquette, Michigan area