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国民(National)机器制造公司是美国最大的以生产冷热锻设备为主的厂家,一八七四年建于美国克利夫兰,一八八二年迁到俄亥俄州的蒂芬城。在美国、西德和日本有五个分公司,其中以西德纽伦堡(Nuerburg)的分公司规模最大。蒂芬的总公司有职工1000人左右,厂房建筑面积56000米～2。为了生产重型锻压机械,在蒂芬城建成一个有200吨吊车、起重能力300吨(两台吊车同时使用)的重型车间,由三跨组成,主跨18.3×110米,两侧的副跨12.2×110米。包括各分公司在内共有职工2000多人,建
National Corporation, the nation’s largest manufacturer of cold and hot forging equipment, was founded in Cleveland in the United States in 1874 and moved to Tiffin, Ohio, in 1882. In the United States, West Germany and Japan have five branches, of which the largest branch in West Germany is Nuerburg. Tiffany’s head office has about 1,000 employees, plant construction area of 56,000 m ~ 2. In order to produce heavy-duty forging machinery, a heavy workshop with 200 tons of cranes and a lifting capacity of 300 tons (both cranes used at the same time) was built in Tiffen City. It consists of three spans with a main span of 18.3 × 110 meters and secondary spans on both sides 12.2 × 110 meters. Including the branches, including a total of more than 2,000 workers, built