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不久以前,美国投产使用了一台用于钻扩汽车刹车蹄片铆钉孔的组合机床。它是由用户自行设计和制造的。其动力头(见图)是由瑞典
Not long ago, the United States put into operation a combined machine tool for drilling rivet holes in automobile brake shoes. It is designed and manufactured by the user. Its power head (see photo) is made by Sweden