File:Mining and Scientific Press - 1885-07-18 - Frue and Triump ore concentrators.jpg
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![File:Mining and Scientific Press - 1885-07-18 - Frue and Triump ore concentrators.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/50/Mining_and_Scientific_Press_-_1885-07-18_-_Frue_and_Triump_ore_concentrators.jpg/800px-Mining_and_Scientific_Press_-_1885-07-18_-_Frue_and_Triump_ore_concentrators.jpg?20130222152536)
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