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English[en]
Gronwall practiced as a civil engineer in Germany (1902-1903) and then immigrated to the United States in 1904, where he worked at various steel works for longer or shorter periods; he was connected with the American Bridge Co., and the Pennsylvania Railroad and other engineering companies.
Chinese[zh]
Gronwall练习作为一个土木工程师在德国( 1902至1903年 ) , 然后移民到美国于1904年,他在那里工作在各个钢铁厂的较长或较短时期,他是与美国桥公司和宾夕法尼亚铁路和其他工程公司。

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