File:Thomas Edison with Walter S. Mallory at Ogdensburg mine. (f6fef3efafb34c1db293b82c2266ca9f).jpg
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![File:Thomas Edison with Walter S. Mallory at Ogdensburg mine. (f6fef3efafb34c1db293b82c2266ca9f).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/46/Thomas_Edison_with_Walter_S._Mallory_at_Ogdensburg_mine._%28f6fef3efafb34c1db293b82c2266ca9f%29.jpg/800px-Thomas_Edison_with_Walter_S._Mallory_at_Ogdensburg_mine._%28f6fef3efafb34c1db293b82c2266ca9f%29.jpg?20220117000714)
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