GB191326138A
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Process for Extracting Metals from Low Percentage Ores.
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GB191127344A
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Improvements in Processes for Extracting Metals from Ores.
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GB191127343A
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Improvements in Processes for Extracting Metals from Ores.
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GB191127342A
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Improvements in Processes for Extracting Metals from Ores.
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GB191127345A
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Processes of Extracting Metals from Ores.
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GB191113499A
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Processes and Apparatus for Extracting Metals from their Ores.
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CA269352A
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Copper processing
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CA289758A
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Copper and zinc extraction method
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CA254320A
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Process for recovering metals contained in ores
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CA244138A
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Ore roasting apparatus
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