File:Two views- top, grinder at Ogdensburg mine; bottom, Thomas Edison with group. (a5511683c8734e5eb27fef934e76616e).jpg
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![File:Two views- top, grinder at Ogdensburg mine; bottom, Thomas Edison with group. (a5511683c8734e5eb27fef934e76616e).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Two_views-_top%2C_grinder_at_Ogdensburg_mine%3B_bottom%2C_Thomas_Edison_with_group._%28a5511683c8734e5eb27fef934e76616e%29.jpg/487px-Two_views-_top%2C_grinder_at_Ogdensburg_mine%3B_bottom%2C_Thomas_Edison_with_group._%28a5511683c8734e5eb27fef934e76616e%29.jpg?20220607152639)
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