File:Jack-knife bridge over Chicago River c. 1908.jpg
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![File:Jack-knife bridge over Chicago River c. 1908.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/bb/Jack-knife_bridge_over_Chicago_River_c._1908.jpg/800px-Jack-knife_bridge_over_Chicago_River_c._1908.jpg?20181203064210)
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