File:1897 - Koch Brothers Advertisement Allentown PA.jpg
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![File:1897 - Koch Brothers Advertisement Allentown PA.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/1897_-_Koch_Brothers_Advertisement_Allentown_PA.jpg/800px-1897_-_Koch_Brothers_Advertisement_Allentown_PA.jpg?20170602021413)
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